1. balance, amount, water, fuel, control, measure, cause, increase 1. The fuel – and –energy balance is important for industry.
2. Conductivity increases with heating.
3. The machine should be re – fuelled.
4. the amount of power used in the world in a year amounts to 12.000 million tons of equivalent fuel.
5. water barriers are crossed by submarine cables.
6.The instrument is foot-controlled by a pedal.
7.Force and motion go together; one is a cause, the other, a result.
8.An electromotive force causes the electrons to move.
9.Control of the apparatus is placed on the panel.
10.The volt is a measure of electromotive force.

2. Complete these sentences, using the correct variant:
1. Circuit a consists of: a) resistors and conductors.
b) a voltage source and resistors.
c) a voltage source, a resistor and a conductor.
2. A voltage source: a) conducts current.
b) reduces current.
c) supplies current.
3. A conductor a) connects the elements.
b) supplies voltage.
c) conducts current.
4. A resistor a) connects the elements.
b) supplies current.
c) reduces current.
5. No current results from: a) an open.
b) a short.

3. Answer the following questions:
1. What elements does a circuit consist of?
2. What is the function of a voltage source?
3. What is the function of a conductor?
4. What is the function of a resistor?
5. When is there no current in a circuit?
6. What does an open or a short result in?
7. What does no current in a circuit result from?

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