В) direct

Earthing is brought about by connecting the metal body or frame directly to .... 6) earth

Ek'clricity and -.. are closely connected. a) magnetism

Electricity flowing ihrough a conductor may be likened to water flowing through a ....б) pipe

Every additional resistance in parallel will reduce the total ... of a circuit. в) resistance

Every component in series in a circuit will add to the total resistance of the circuit and decrease the ... flowing through it. 6) cuiient

... has a nnich lower resistance than other common metals. в) copper

If a conductor is made to rotate in a magnetic field, a pressure of electricity, called a .... is produced in it. 6) voltage

If lightning strikes the building, the charge is conducted safely to ... . a) earlh

If the number of turns in the secondary winding is greater than the number in the primary, it is a ... transformer. г) step-up

In a radio the valve allows the flow of electrons from cathode to ... . a) anode

In a three-pin power plug the thickest... is always the earth connection. в) pin

Insulation, earthing, fuses and automatic cutouts are among the most common ... devices. д) safety

Insulating is the converting of a conductor with a non-conducting material to prevent it from touch ing another.... a) conductor

It is cheaper and easier to carry a veiyhigh ... but low current, over long distances. г) voltage

It is convenient and economical lo operate electronic apparatus from a .... в) distance

It is very impoilant lhat fuse wire of the correct... is used. 6) amperage

It is often necessary to increase or... the voltage of electricity supply. в) decrease

Large switches which are used for high voltages are known as circuit.... a) breakers

Many precautions are taken and safety ... are used to minimize electric dangers. г) devices

... materials are used to cover and protect conductor wires and sometimes to separate them,

д) insulating

Most ... are good conductors. в) metals

Most of the world's electricity for ... and industrial use is made or generated in hydro-electric stations.

a) domestic

Radio and tele ision receivers do not use alternating but direct.... a) domestic

Similar charges ot'electricity will ... д) repel

Temperature or,.. control or timing devices can operate switches automatically. б) pressure

The amount of electricity that flows is measured in units called .... в) amperes

The armature is returned to its former position by a ... . а)spring

The attraction of small particles or objects is caused by an electrical... в) charge

The coils are called windings, one is the primary, or input winding, and the other is the secondary, or... winding. в) output

Two different kinds of electricity are used to operate electronic apparatus: direct current and ... current.

6) Alternating

The frequency of the alternating current in most parts of Europe is 50 .... a) cycles

The main contacts of a switch are cal led .... г) poles

The microphone contains a very thin and flexible metal disc called a ... . д) diaphragm

The most common safety device and one that is used in every household installation is the ordinary ... . д) fuse

The most common way of making electricity is by the conversion of... energy. б) mechanical

The number of changes of current direction, called cycles, in every second is known as the ... . д) frequency

The poles are connected when the ... is on. д) switch

The purpose of a switch is to make complete or to break an electrical... a) circuit

The resistance of a ... will also vary according to the material of which it is made. 6) conductor

The restriction to the flow caused by the conductor is known as its ... д) resistance

The simple fuse is a piece of... that is connected in series in the circuit. a) wire

The smallest piece of any substance is called an …. . в) atom

The telephone consists of two main parts, the ... and the earphone. г) microphone

The transistor has contribute'! greatly to rapid development in ... travel. в) space

The ... uses very little electric current. в) telephone

The unit of capacitance is called a … а)farad

The voltage is measured in ... г) volts

The ... of all electrical appliances are made of an insulating material such as rubber or moulded plastics.