ENGLISH Ез 3сем / E Exam sentences Eng

An induction motor or asynchronous motor is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction.

If by some chance this happens, the rotor typically slows slightly until a current is re-induced and then the rotor continues as before.

This varying magnetic field induces a varying electromotive force (EMF) or "voltage" in the secondary winding.

There are two types of batteries: primary batteries (disposable batteries), which are designed to be used once and discarded when they are exhausted, and secondary batteries (rechargeable batteries), which are designed to be recharged and used multiple times.

Fossil fuelled power plants may also use a steam turbine generator or in the case of natural gas fired plants may use a combustion turbine.

The basic difference between an induction motor and a synchronous AC motor is that in the latter a current is supplied into the rotor (usually DC) which in turn creates a (circular uniform) magnetic field around the rotor.

The motor takes its name from the shape of its rotor "windings"- a ring at either end of the rotor, with bars connecting the rings running the length of the rotor.

It is not directly a power loss, but results in inferior voltage regulation, causing the secondary voltage to fail to be directly proportional to the primary, particularly under heavy load.

An electrical battery is a combination of one or more electrochemical cells used to convert stored chemical energy into electrical energy.

Nuclear power plants use a nuclear reactor's heat to operate a steam turbine generator.

An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side.

The magnetic field on the rotor is either generated by current delivered through slip rings or by a permanent magnet.

If a load is connected to the secondary, an electric current will flow in the secondary winding and electrical energy will be transferred from the primary circuit through the transformer to the load.

The electrodes do not touch each other but are electrically connected by the electrolyte.

In thermal power stations, mechanical power is produced by a heat engine that transforms thermal energy, often from combustion of a fuel, into rotational energy.

In a DC motor the power is supplied to the armature directly from a DC source, while in an induction motor this power is induced in the rotating device.

Most common AC motors use the squirrel cage rotor, which will be found in virtually all domestic and light industrial alternating current motors.

Transformers range in size from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used to interconnect portions of power grids.

These are most commonly used in portable devices that have low current drain, are only used intermittently, or are used well away from an alternative power source, such as in alarm and communication circuits where other electric power is only intermittently available.

Steam turbine plants use the dynamic pressure generated by expanding steam to turn the blades of a turbine.

There are two types of AC motors, depending on the type of rotor used.

Very low voltages at very high currents are typical in the bars and end rings; high efficiency motors will often use cast copper in order to reduce the resistance in the rotor.

A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core, and thus a varying magnetic field through the secondary winding.

Rechargeable batteries or secondary cells can be recharged by applying electrical current, which reverses the chemical reactions that occur during its use.

The efficiency of a steam turbine is limited by the maximum temperature of the steam produced and is not directly a function of the fuel used.

Unlike the normal transformer which changes the current by using time varying flux, induction motors use rotating magnetic fields to transform the voltage.

Furthermore, a stalled squirrel cage motor (overloaded or with a jammed shaft) will consume current limited only by circuit resistance as it attempts to start.

In the vast majority of transformers, the windings are coils wound around a ferromagnetic core, air-core transformers being a notable exception.

Secondary batteries must be charged before use; they are usually assembled with active materials in the discharged state.

A power station is an industrial facility for the generation of electric power.

Induction motors are now the preferred choice for industrial motors due to their rugged construction, absence of brushes (which are required in most DC motors) and the ability to control the speed of the motor.

In order to prevent the currents induced in the squirrel cage from superimposing itself back onto the supply, the squirrel cage is generally constructed with a prime number of bars, or at least a small multiple of a prime number (rarely more than 2).

Leakage results in energy being alternately stored in and discharged from the magnetic fields with each cycle of the power supply.

The oldest form of rechargeable battery is the lead-acid battery.

At the center of nearly all power stations is a generator, a rotating machine that converts mechanical energy into electrical energy by creating relative motion between a magnetic field and a conductor.

Natural-gas fuelled (and oil fueled) combustion turbine plants can start rapidly and so are used to supply "peak" energy during periods of high demand, though at higher cost than base-loaded plants.

A battery is a device that converts chemical energy directly to electrical energy.

In an ideal transformer, the induced voltage in the secondary winding is in proportion to the primary voltage, and is given by the ratio of the number of turns in the secondary to the number of turns in the primary.

The second type is the induction motor, which runs slightly slower than the supply frequency.

The rotating magnetic field of the stator will impose an electromagnetic torque on the still magnetic field of the rotor causing it to move (about a shaft) and rotation of the rotor is produced.

An electric motor converts electrical power to mechanical power in its rotor (rotating part).

The vast majority of the rotor currents will flow through the bars rather than the higher-resistance and usually varnished laminates.

The ideal transformer model assumes that all flux generated by the primary winding links all the turns of every winding, including itself.

Miniature cells are used to power devices such as hearing aids and wristwatches; larger batteries provide standby power for telephone exchanges or computer data centers.

Solar thermal electric plants use sunlight to boil water, which turns the generator.

This battery is notable in that it contains a liquid in an unsealed container, requiring that the battery be kept upright and the area be well ventilated to ensure safe dispersal of the hydrogen gas produced by these batteries during overcharging.

A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils.

The magnetic field on the rotor of this motor is created by an induced current.

These currents interact with the rotating magnetic field created by the stator and in effect causes a rotational motion on the rotor.

An unloaded squirrel cage motor at rated no-load speed will consume electrical power only to maintain rotor speed against friction and resistance losses; as the mechanical load increases, so will the electrical load - the electrical load is inherently related to the mechanical load.

It is called synchronous because at steady state the speed of the rotor is the same as the speed of the rotating magnetic field in the stator.

Unless something else limits the current (or cuts it off completely) overheating and destruction of the winding insulation is the likely outcome.

Air gaps are also used to keep a transformer from saturating, especially audio-frequency transformers in circuits that have a direct current flowing through the windings.

Primary batteries can produce current immediately on assembly.

Thermal power plants are classified by the type of fuel and the type of prime mover installed.

About 80% of all electric power produced in the world is by use of steam turbines.

The lead-acid battery is also very heavy for the amount of electrical energy it can supply.

While new technologies have eliminated the need for transformers in some electronic circuits, transformers are still found in nearly all electronic devices designed for household ("mains") voltage.

The first is the synchronous motor, which rotates exactly at the supply frequency.

By way of contrast, the induction motor does not have any direct supply onto the rotor; instead, a secondary current is induced in the rotor.

An induction motor or asynchronous motor is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction.

If by some chance this happens, the rotor typically slows slightly until a current is re-induced and then the rotor continues as before.

This varying magnetic field induces a varying electromotive force (EMF) or "voltage" in the secondary winding.

There are two types of batteries: primary batteries (disposable batteries), which are designed to be used once and discarded when they are exhausted, and secondary batteries (rechargeable batteries), which are designed to be recharged and used multiple times.

Fossil fuelled power plants may also use a steam turbine generator or in the case of natural gas fired plants may use a combustion turbine.

The basic difference between an induction motor and a synchronous AC motor is that in the latter a current is supplied into the rotor (usually DC) which in turn creates a (circular uniform) magnetic field around the rotor.

The motor takes its name from the shape of its rotor "windings"- a ring at either end of the rotor, with bars connecting the rings running the length of the rotor.

It is not directly a power loss, but results in inferior voltage regulation, causing the secondary voltage to fail to be directly proportional to the primary, particularly under heavy load.

An electrical battery is a combination of one or more electrochemical cells used to convert stored chemical energy into electrical energy.

Nuclear power plants use a nuclear reactor's heat to operate a steam turbine generator.

An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side.

The magnetic field on the rotor is either generated by current delivered through slip rings or by a permanent magnet.

If a load is connected to the secondary, an electric current will flow in the secondary winding and electrical energy will be transferred from the primary circuit through the transformer to the load.

The electrodes do not touch each other but are electrically connected by the electrolyte.

In thermal power stations, mechanical power is produced by a heat engine that transforms thermal energy, often from combustion of a fuel, into rotational energy.

In a DC motor the power is supplied to the armature directly from a DC source, while in an induction motor this power is induced in the rotating device.

Most common AC motors use the squirrel cage rotor, which will be found in virtually all domestic and light industrial alternating current motors.

Transformers range in size from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used to interconnect portions of power grids.

These are most commonly used in portable devices that have low current drain, are only used intermittently, or are used well away from an alternative power source, such as in alarm and communication circuits where other electric power is only intermittently available.

Steam turbine plants use the dynamic pressure generated by expanding steam to turn the blades of a turbine.

There are two types of AC motors, depending on the type of rotor used.

Very low voltages at very high currents are typical in the bars and end rings; high efficiency motors will often use cast copper in order to reduce the resistance in the rotor.

A varying current in the first or primary winding creates a varying magnetic flux in the transformer's core, and thus a varying magnetic field through the secondary winding.

Rechargeable batteries or secondary cells can be recharged by applying electrical current, which reverses the chemical reactions that occur during its use.

The efficiency of a steam turbine is limited by the maximum temperature of the steam produced and is not directly a function of the fuel used.

Unlike the normal transformer which changes the current by using time varying flux, induction motors use rotating magnetic fields to transform the voltage.

Furthermore, a stalled squirrel cage motor (overloaded or with a jammed shaft) will consume current limited only by circuit resistance as it attempts to start.

In the vast majority of transformers, the windings are coils wound around a ferromagnetic core, air-core transformers being a notable exception.

Secondary batteries must be charged before use; they are usually assembled with active materials in the discharged state.

A power station is an industrial facility for the generation of electric power.

Induction motors are now the preferred choice for industrial motors due to their rugged construction, absence of brushes (which are required in most DC motors) and the ability to control the speed of the motor.

In order to prevent the currents induced in the squirrel cage from superimposing itself back onto the supply, the squirrel cage is generally constructed with a prime number of bars, or at least a small multiple of a prime number (rarely more than 2).

Leakage results in energy being alternately stored in and discharged from the magnetic fields with each cycle of the power supply.

The oldest form of rechargeable battery is the lead-acid battery.

At the center of nearly all power stations is a generator, a rotating machine that converts mechanical energy into electrical energy by creating relative motion between a magnetic field and a conductor.

Natural-gas fuelled (and oil fueled) combustion turbine plants can start rapidly and so are used to supply "peak" energy during periods of high demand, though at higher cost than base-loaded plants.

A battery is a device that converts chemical energy directly to electrical energy.

In an ideal transformer, the induced voltage in the secondary winding is in proportion to the primary voltage, and is given by the ratio of the number of turns in the secondary to the number of turns in the primary.

The second type is the induction motor, which runs slightly slower than the supply frequency.

The rotating magnetic field of the stator will impose an electromagnetic torque on the still magnetic field of the rotor causing it to move (about a shaft) and rotation of the rotor is produced.

An electric motor converts electrical power to mechanical power in its rotor (rotating part).

The vast majority of the rotor currents will flow through the bars rather than the higher-resistance and usually varnished laminates.

The ideal transformer model assumes that all flux generated by the primary winding links all the turns of every winding, including itself.

Miniature cells are used to power devices such as hearing aids and wristwatches; larger batteries provide standby power for telephone exchanges or computer data centers.

Solar thermal electric plants use sunlight to boil water, which turns the generator.

This battery is notable in that it contains a liquid in an unsealed container, requiring that the battery be kept upright and the area be well ventilated to ensure safe dispersal of the hydrogen gas produced by these batteries during overcharging.

A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils.

The magnetic field on the rotor of this motor is created by an induced current.

These currents interact with the rotating magnetic field created by the stator and in effect causes a rotational motion on the rotor.

An unloaded squirrel cage motor at rated no-load speed will consume electrical power only to maintain rotor speed against friction and resistance losses; as the mechanical load increases, so will the electrical load - the electrical load is inherently related to the mechanical load.

It is called synchronous because at steady state the speed of the rotor is the same as the speed of the rotating magnetic field in the stator.

Unless something else limits the current (or cuts it off completely) overheating and destruction of the winding insulation is the likely outcome.

Air gaps are also used to keep a transformer from saturating, especially audio-frequency transformers in circuits that have a direct current flowing through the windings.

Primary batteries can produce current immediately on assembly.

Thermal power plants are classified by the type of fuel and the type of prime mover installed.

About 80% of all electric power produced in the world is by use of steam turbines.

The lead-acid battery is also very heavy for the amount of electrical energy it can supply.

While new technologies have eliminated the need for transformers in some electronic circuits, transformers are still found in nearly all electronic devices designed for household ("mains") voltage.

The first is the synchronous motor, which rotates exactly at the supply frequency.

By way of contrast, the induction motor does not have any direct supply onto the rotor; instead, a secondary current is induced in the rotor.