| 1. frequency | 1. || |
| 2. alternating current | 2. |
| 3. voltage source | 3. |
| 4. is applied | 4. |
| 5. it is easy to transform | 5. |
4 Make up the sentences
1. Current, flow, is, electricity, of.
2. One, direct, flows, direction, is current, only.
3. Changes, current, direction, the alternating, flow, of.
4. Alternating, cane, changed, be current, direct, into.
5. Use, we, everywhere, electricity.
5 Choose the right variant
1) This pencil short?
a) am b) are c) is
2) They in the park,
a) are b) am c) is
3) I a student?
a) are b) am c) is
4) It winter.
a) is b) are c) am
5)... you do for a walk after school?
a) do b) does c) did
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1 Read and translate the text
Branches of Electricity
The study of electricity can be divided into three branches: magnetism, electrostatics and electrodynamics. Magnetism is the property of the molecules of iron and some other substances to store energy in a field of force. Electrostatics is the study of electricity at rest. Rubbing glass with a silk produces static electricity. Electrodynamics is the study of electricity in motion, or dynamic electricity. The electric current which flows through wires is a good example of the dynamic electricity.
A difference of electrical pressure is necessary to maintain a flow of electricity in a conductor. Different substances differ in electrical conductivity. Atoms of many substances give up electrons with ease. Electrical energy has intensivity and quantity.
2 Answer the questions:
1). What branches of electricity do you know?
2) What is magnetism?
3) Electrostatics is the study of electricity at rest, isn't it?
4) What does the term "electrodynamics" mean?
5) Do different substances differ in electrical conductivity?
. 3 Match the sides.
| 1.To story energy in the field of force | 1. |
| 2.To produce static electricity | 2. |
| 3..A difference of electric pressure | 3.³ |
| 3. 4.To differ in electrical conductivity | 4.г |
| 5To have intensivety and quantity | 5. |
4 Make up the sentences
1). We, three, know, of, branches, electricity.
2) Can, be, magnetism, induced.
3) Is, electricity, completely, with, intermingled, magnetism.
|
|
|
4) Energy, is, in, electrical, measured, and, amperes, volts.
5) Substances, differ, different, electrical, in, conductivity.
5 Choose the right variant
1). We... static electricity by rubbing glass with silk.
a) to produce b) produce c) produces
2) Electrical energy.........in amperes and volts.
a) can be measured b) could be measured c) would be measured
3) Electrodynamics... electricity in motion.
a) studies b) studied c) study
4) Magnetic effects of electric current......in all electromechanical apparatus.
a) is employed b) are employed c) be employed
5) Magnetism... energy in a field of force.
a) stores b) store c) stored
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