iGCSE Physics Mains Electricity

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1. The safety device that limits the current flow in a plug is the

A). fuse
B). cable grip
C). earth wire
D). insulation

2. Where should the earth wire be connected inside a metal toaster?

A). power supply
B). heating element
C). metal casing
D). Eath wire not needed in a metal appliance

3. This table describes electrical properties of parts of a mains plug. Which answer is correct?

	mains plug metal pins	Mains cable outer casing	plug casing
A).	conductor	insulator	insulator
B).	insulator	conductor	insulator
C).	insulator	insulator	conductor
D).	conductor	conductor	insulator

4. This hair dryer has a case made of plastic. It only needs 2 wires for safe use, and does not need an earth wire.

Devices like this are called ...

A). neutral devices
B). safety checked
C). current controlled
D). double insulated

5. When a current passes through a resistance wire it gets hot. Which of these appliances does NOT use this effect?

A). Toaster
B). Microwave
C). Hairdryer
D). Kettle

6. Which of these is the correct formula for electrical power?

A). P = IV
B). V = IR
C). V = PI
D). P = V/I

7-10: The table below gives some appliances and some information about their electical properties.
Fill in the missing gaps and choose the correct fuse for the toaster.

Appliance	Power	Current	Voltage	Fuse
Kettle		11 A	110 V	-
Toy car	0.6W	100 mA		-
Toaster	1.2kW		240 V