Mains Electricity Exam-style Questions | GCSE Physics OCR 21st Century Higher Triple

Question 1

This question is about mains electricity in the UK.

The UK mains supply is an A.C. supply.

a)

Describe what an A.C. supply is.

(0/2 marks)

b)

In UK plugs, the live wire is

A

blue

B

brown

C

green and yellow stripe

D

random

(0/1 marks)

c)

The neutral wire is

A

blue

B

brown

C

green and yellow stripe

D

random

(0/1 marks)

c)

The Earth wire is

A

blue

B

brown

C

green and yellow stripe

D

random

(0/1 marks)

d)

Which wire should the fuse be connected to?

A

live

B

earth

C

neutral

(0/1 marks)

0

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6

Question 2

a)

A fridge has a power rating of 800 W.

Calculate the energy required to run the fridge for 1 day.

(0/3 marks)

b)

The fridge operates of the UK mains supply.

State the operating voltage and frequency of the UK mains supply.

(0/2 marks)

c)

Calculate the operating current of the fridge.

(0/3 marks)

0

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8

Question 3

A homeowner needs to replace the heating element in their electric oven.

The table below summarises the details of 3 different heating elements.

a)

Calculate the power of heating element B.

Give your answer to 3 significant figures.

(0/2 marks)

b)

The oven is turned on for 40 minutes.

Calculate how much extra energy heating element uses compared to heating element A.

(0/5 marks)

c)

Both heating elements A and B are capable of heating the oven.

Explain heating element should the homeowner install.

(0/2 marks)

0

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9

Question 4

a)

This question is about an electric hairdryer.

The hairdryer contains a heating element, an electric fan and a plastic case.

The hairdryer runs off the UK mains supply.

State the voltage and frequency of the UK mains supply.

(0/2 marks)

b)

The power of the hairdryer is 1.2 kW.

Explain what is meant by 1.2 kW.

(0/1 marks)

c)

Calculate the energy transferred in 10 minutes of operation.

(0/3 marks)

0

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6

Question 5

This question is about a coffee machine.

a)

The heating element of the coffee machine is rated at 1,500 W, 230 V.

Calculate the resistance of the heating element. Give your answer to 1 decimal place.

(0/3 marks)

b)

Calculate the current flowing through the heating element. Give your answer to 2 decimal places.

(0/3 marks)

0

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6

Question 6

a)

10 W is equivalent to

A

10 J/C

B

10 J/s

C

10 J

(0/1 marks)

The UK Mains supply is

A

230 V, 50 Hz - alternating current

B

230 V - direct current

C

330 V, 150 Hz - alternating current

D

330 V - direct current

(0/1 marks)

0

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2