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# Electronic calculations - Test

1.

The symbol I in electronic calculations represents:

2.

What unit is resistance measured in?

3.

Which of the following is equal to 100 microfarads?

4.

The current passing though a resistor is 20 milliamps. The value of the resistor is 100 ohms. Calculate the potential difference across the resistor.

5.

Two resistors, R1 and R2, are in series. R1 has a value of 330 ohms and R2 has a value of 470 ohms. Calculate the combined resistance.

6.

A potential divider has a total potential difference across it of 10 volts. The value of the resistor R1 is 2,000 ohms and R2 is 3,000 ohms. Calculate the output voltage.

7.

A simple timer circuit contains a 10 kilo-ohm resistor and a 100 microfarad capacitor. Calculate the time constant.

8.

An astable circuit contains components with the following values: R1 40 kilo-ohms, R2 60 kilo-ohms and a 100 microfarad capacitor. Calculate the mark time.

9.

An astable circuit has a pulse that is high for 3 seconds and low for 2 seconds. Calculate the mark/space ratio.

10.

An operational amplifier has a feedback resistor of value 3.3 kilo-ohms and a 1 kilo-ohm input resistor. Calculate its gain.