IGCSE Electricity

The electrical resistance of insulators is

• High

• Low

• Zero

• Infinitely high

An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?

• 440 W

• 110 W

• 55 W

• 0.0023 W

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In the circuits shown, all resistors are identical

Which circuit has the least resistance?

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• 
• 
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• A

• B

• C

• D

What would be the reading on the voltmeter?

• 2 V

• 6 V

• 4 V

• 8 V

• A

• B

• C

• D

A teacher writes a set of notes about two non-identical bulbs which are connected in parallel

He makes one mistake. Which of the statements below is incorrect?

• They have the same current flowing through them

• They have the same potential difference across them

• They can be switched on and off individually

• If one bulb blows, the other will continue to work

What is component Z ?

(a)  

What is component B

• Thermistor

• Resistor

• Light Dependent Resistor

• Relay