The ammeter is

a) A common meter

b) An uncommon meter

In order to measure the value of current

a) The ohmmeter is used

b) The voltmeter is used

c) The ammeter is used

A meter has

a) Positive terminals only

b) Negative terminals only

c) Positive and negative terminals

When the ammeter is used

a) The circuit should be open

b) The circuit should not be open

The ammeter should be connected

a) In series

b) In parallel

3. Make up sentences, using words and word-combinations.

Resistor, current, pass, temperature, produce, reduce, varied, variable resistor, to measure, to change

Additional material for card № 3

1. Read the text, translate it and answer the questions.

Meters

The most common meters used are the ohmmeter, ammeter and the voltmeter. The ohmmeter is used to measure the value of resistance. It consists of a milliammeter calibrated to read in ohms, a battery and a resistor. The meter is connected in parallel and the circuit is not opened when its resistance is measured. The readings on the scale show the measured value.

The ammeter is used to measure the value of current. When the ammeter is used the circuit should be opened at one point and the terminals of the meter should be connected to it. One should take into consideration that the positive terminal of the meter is connected to the positive terminal of the source.

1. What are the most common meters?

2. What is ammeter used for?

3. What is the function of ohmmeter?

2. Find the correct variant.

A resistor is used

a) To measure the resistance

b) To reduce the current

c) To change the resistance

d) To produce the IR voltage drop

When current passes through a resistor

a) Its temperature drops

b) Its temperature rises

Resistors are rated

a) In ohms

b) In volts

c) In watts

Power is given

a) In amperes

b) In watts

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