O LevelPhysicsCambridgeTopic Questions4. Electricity & Magnetism4.4 Practical Electricity

Practical Electricity (Cambridge O Level Physics)

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1
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q3-easy-mcq-4-3-electrical-circuits-cie-igcse-physics

Which of the circuit diagrams above shows a fuse which has been correctly connected?

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1
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A person wants to install a circuit breaker to protect themselves and their lawnmower from too much current.

Under normal operating conditions, the lawnmower carries 4 A of current.

The manufacturer provides the graph below with the circuit breaker.

q10-hard-mcq-4-3-electrical-circuits-cie-igcse-physics

What will happen when the current is 4 A, and what will happen if the current rises to 14 A?

 

4 A

14 A

A

circuit does not break

circuit does not break

B

circuit does not break

circuit breaks quickly

C

circuit breaks quickly

circuit does not break

D

circuit breaks quickly

circuit breaks quickly

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The plug for an electric lamp contains a 3 A fuse. The fuse’s job is to protect the lamp if too much current flows.

Where is the fuse positioned, and what happens when the fuse does its job?

 

Where is it positioned?

What does it do?

A

live wire

reduces the current to 3 A

B

neutral wire

breaks the circuit

C

live wire

breaks the circuit

D

neutral wire

reduces the current to 3 A

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2
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Which of the diagrams below shows a fuse which has been correctly connected to a circuit?

q2-medium-mcq-4-3-electrical-circuits-cie-igcse-physics

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Both fuses and circuit breakers are devices which protect devices from high currents that could cause them to get too hot and catch fire.

The diagram shows two possible positions where a fuse or a circuit breaker could be positioned.

q3-medium-mcq-4-3-electrical-circuits-cie-igcse-physics

Which location would be suitable for a fuse, and which would be suitable for a circuit breaker?

 

Fuse

Circuit breaker

A

P

P

B

P

Q

C

Q

P

D

Q

Q

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4
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The diagram shows two bulbs, which have been connected in parallel. A fuse has been included in the circuit.

Each of the ammeters reads 1.2 A.

q4-medium-mcq-4-3-electrical-circuits-cie-igcse-physics

What fuse should be put in this circuit?

  • 1.0 A

  • 3.0 A

  • 5.0 A

  • 13.0 A

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5
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The fuse blows in a kettle, and the owner of the kettle, Brooke Bond decides to replace the fuse. The fuse he takes out has 13 A written on it. 

Brooke does not have any fuses in the cupboard with 13 A written on them, so he replaces it with a fuse that has 3 A written on it.

He then switches the kettle on to make a nice cup of tea. What happens?

  • The kettle explodes in a shower of sparks and molten plastic.

  • The fuse does not blow, and the kettle operates normally.

  • The fuse blows and the kettle remains undamaged.

  • The fuse does not blow, but the kettle does not work.

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6
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The diagram shows a toaster that has been wired up.

Three fuses have been connected to the toaster, but only one or two have been connected correctly.

q6-medium-mcq-4-3-electrical-circuits-cie-igcse-physics

Which of the fuses has been positioned correctly?

  • Fuse X and fuse Y

  • Fuse X only

  • Fuse Z only

  • Fuse X and fuse Z

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7
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An oven is wired into somebody’s kitchen. The oven is protected by a fuse, and functions normally, but the owner notices that the wires that connect the oven to the mains electricity supply get quite hot.

What could be done to reduce the temperature of the wires?

  • Add a circuit breaker to the circuit.

  • Put thicker insulation on the wires.

  • Replace the wires with thicker diameter wires.

  • Replace the wires with thinner diameter wires.

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8
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A student sets up the circuit below, it contains four fuses and four bulbs.

She finds that none of the bulbs are lit, but only one of the fuses has blown.

Which fuse has blown?

q10-medium-mcq-4-3-electrical-circuits-cie-igcse-physics

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9
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The e.m.f. of the battery in a radio is 3.0 V. 

The resistance of the circuit in the radio is 6.0 Ω. 

The radio is switched on.

How much energy is transferred from the battery in 30 minutes?

  • 45 J

  • 900 J

  • 2700 J

  • 32400 J

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10
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What is the unit for the energy used by an electrical appliance?

  • ampere

  • kilowatt-hour

  • volt

  • watt

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11
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A 100W lamp is switched on for five hours each day for three weeks. 

The cost of one unit of electricity is $0.24. 

How much does it cost to run the lamp for this time?

  • $0.36

  • $0.84

  • $2.52

  • $25.20

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12
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The information on the back of an electric room heater is shown.

q31-cie-ol-physics-paper-1-2021-mcq

What is a suitable fuse rating for this room heater?

  • 4.0 A

  • 4.2 A 

  • 5.0 A

  • 13.0 A

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