Electrical safety — Paper 1 · IGCSE Sciences - Co-ordinated (9-1) 0973

38 A fuse is a safety device for use in an electrical circuit. The current in the circuit becomes greater than the rated value for the fuse. What happens? A The current decreases to zero. B The current decreases to the rated value for the fuse. C The thickness of the insulation around the wires increases. D The current is sent to the outer case of the appliance.

1 marks

Answer: A

This question in 0973/11 May/June 2020

38 A fuse is a safety device for use in an electrical circuit. The current in the circuit becomes greater than the rated value for the fuse. What happens? A The current decreases to zero. B The current decreases to the rated value for the fuse. C The thickness of the insulation around the wires increases. D The current is sent to the outer case of the appliance.

1 marks

Answer: A

This question in 0973/12 May/June 2020

38 A student connects the circuit shown. fuse When the switch is closed the fuse blows and stops the current. What is a possible reason for this? A The current rating of the fuse is too high. B The current is too large. C The lamp is too dim. D The voltage is too small.

1 marks

Answer: B

This question in 0973/11 May/June 2021

38 A student connects the circuit shown. fuse When the switch is closed the fuse blows and stops the current. What is a possible reason for this? A The current rating of the fuse is too high. B The current is too large. C The lamp is too dim. D The voltage is too small.

1 marks

Answer: B

This question in 0973/12 May/June 2021

39 The table shows the usual current in each of four household appliances and the fuse used to protect each of them. The only fuses available are rated at 3 A, 5 A or 13 A. Which row shows an appliance that has been fitted with the most appropriate of the fuses available? appliance current / A fuse rating / A A hairdryer 5.5 5 B kettle 7.5 13 C lawnmower 5.0 3 D slow cooker 1.0 5

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2021

38 A 240 V mains lamp operating normally has a working resistance of 480 . Which rating of fuse is most suitable to use with this lamp? A 0.4 A B 1 A C 2 A D 4 A

1 marks

Answer: B

This question in 0973/11 May/June 2022

39 The diagram shows a circuit containing an electric heater, a motor and a fuse. The current in the heater is 6.0 A and the current in the motor is 2.0 A. heater M motor What is an appropriate rating for the fuse? A 2 A B 4 A C 6 A D 10 A

1 marks

Answer: D

This question in 0973/12 May/June 2022

39 The current in an electric heater during normal use is 11 A. What is an appropriate rating for a fuse to protect the heater? A 3 A B 10 A C 13 A D 36 A

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2022

38 Fuses are used in domestic electric circuits. Which statement about fuses is correct? A A fuse is connected in the live wire. B A fuse is connected in the neutral wire. C A 3.0 A fuse produces a current of exactly 3.0 A in the circuit. D A 3.0 A fuse produces a minimum current of 3.0 A in the circuit.

1 marks

Answer: A

This question in 0973/11 May/June 2023

39 The current in an electric kettle used to boil water is 9.0 A. What is the most appropriate rating of fuse to use with this kettle? A 1 A B 3 A C 8 A D 13 A

1 marks

Answer: D

This question in 0973/11 Oct/Nov 2023

38 The maximum current in an electric circuit is 10 A. What is the most appropriate rating of a fuse for this circuit? A 5 A B 9 A C 13 A D 25 A

1 marks

Answer: C

This question in 0973/11 May/June 2024

38 The voltage across an electric heater is 240 V and the current in the heater is 3.0 A. The heater is connected in a circuit with a fuse. Which fuse rating is the most suitable? A 1 A B 2 A C 5 A D 240 A

1 marks

Answer: C

This question in 0973/11 May/June 2025

38 Component X protects the circuit shown in the diagram. X What is component X? A fixed resistor B fuse C switch D variable resistor

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2025