- •Electricity and magnetism
- •3. Practice reading the following formulas:
- •The electric field
- •Vocabulary Exercises
- •Wave types
- •How Does a Radio Work?
- •Electric charge
- •Magnetism
- •The bare infinitive
- •4. Put “to” where necessary.
- •6. Make infinitives (add “to”) or gerunds (add “-ing”) of the verbs in brackets to make the following sentences grammatically correct.
- •7. Complete the following sentences with infinitives (add “to”) or gerunds (add “-ing”) of the verbs below to make them grammatically correct.
- •8. Make infinitives (with or without “to”) or gerunds (add “-ing”) of the verbs in brackets to make the following sentences grammatically correct.
- •Use of electricity to cure mental diseases
- •Feeling electric fields
- •Hopping electron sand the biggest disappointment of the television industry
- •How do nerves work?
- •2.Use the appropriate form of the infinitive.
Vocabulary Exercises
Find the equivalents to the words
-
1.To repel
Propagate
stationary charge
To attract
Aerial
strength of field
per unit charge
uniform field
nonuniform field
like charges
wire
transverse
variable
line of force
однородное поле
притягивать
антенна
силовая линия
поперек
напряженность поля
на единицу заряда
отталкивать
неоднородное поле
одноименные заряды
неподвижный заряд
провод
распространять
переменный
2. Fill in the blanks with a suitable word. Use the correct form:
to repel, to attract, to affect, to increase, to decrease, to depend on, to contain, to vary, to consist of, an excess, a lack.
1. Various factors ..... the resistance of a conductor.
2. The resistance of metals …… with a rise in temperature.
3. The resistance of carbon, semiconductors ...... as their temperature is raised.
4. How does the resistance of a conductor ...... with its length?
5. Objects that are similarly charged ... each other; those with unlike charges ... each other.
6. All matter ....... both positive and negative charges.
7. An ordinary uncharged atom ...…the same number of protons and electrons.
8. Resistivity ... the material composing the wire and its temperature.
9. The rubber rod becomes negatively charged due to ... of electrons and the fur becomes positively charged due to ... of electrons.
Part II.
Read the texts and make up questions of different types:
Wave types
A wave is a disturbance that propagates through empty space or a medium such as air or water, usually transporting energy as it travels.
In «transverse waves», the disturbance is at right angles to the wave's direction of motion. Electromagnetic radiation, including visible light, is a form of transverse wave in which magnetic and electric fields oscillate at right angles to the wave’s direction of travel. In «longitudinal waves», the disturbance is parallel to the wave's direction. These include sound waves in gases and liquids. Water waves are an example of a wave that is both transverse and longitudinal - a floating cork will move in a circle as a wave washes past it.
Waves are characterized by their wavelength (the distance between peaks or compressions], frequency (the rate at which waves pass a given point and amplitude or intensity. Standing or stationary waves occur when waves are held in a fixed position - for instance, when a guitar string vibrates. Such waves always involve a whole or half-number of waves, and hence the length of the string determines the wavelengths it can maintain.