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?
A present from Chicago
That year the winter in Chicago was very bad. One morning, when railway workers came to the station, they saw a lot of snow that had fallen the night before. The workers didn't know what to do with it. They hadn't seen so much snow. They could not leave the snow on the platforms because it was dangerous for passengers.Suddenly one of the workers had a wonderful idea. The workers put the snow on the freight train and sent it south to Texas. The workers thought that the snow would melt away on the way.The next day five tons of snow arrived in Oklahoma City. The railway workers in Oklahoma City were very happy when they saw what Chicago workers had sent them. "It's a wonderful present," they said and put the snow on the children's playground. Some of the children in Oklahoma City had never seen snow before!