year 9 mains electricity & forces revision

State which wire in a plug should be in series with the fuse.

• earth

• live

• neutral

• cable

The fuse is an electrical safety feature used in mains-operated domestic appliances.

what other electrical safety features can be used in mains-operated domestic appliances.

• earth wire

• circuit breaker

• double insulation

• metal casing

Explain how a fuse protects a domestic appliance

• When too much current flows it will melt the fuse breaking the circuit

• When current is too low the fuse increases the current

• The fuse sticks the wires to the pins

In a plug what colour is the earth wire

• blue

• brown

• yellow and green

• green

State the formula linking power, current and voltage.

• P=IV

• P=I/V

• P=CV

• I=PV

A hair dryer has a current of 9.6 A.

 The mains supply voltage is 230 V. Calculate the power of the hair dryer

• 24P

• 2208W

• 2208P

• 0.04W

What is the correct unit for power

• watts

• amps

• volts

• ohms

What is the correct unit for current

• watts

• amps

• volts

• ohms

What is shown in the picture

• fuses

• wires

• circuits

• plugs

what is the correct unit for potential difference

• watts

• amps

• volts

• ohms