Electrical safety — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

38 A circuit contains a lamp and a fuse. There is a current of 2.0 A in the lamp and it operates normally. A fault develops in the lamp. The current in the circuit increases, and the fuse now blows. The diagrams show two circuits. diagram 1 diagram 2 Which is the circuit used and what is the effect of the fuse when it blows? circuit effect of fuse A diagram 1 reduces current to 0 B diagram 1 reduces current to 2.0 A C diagram 2 reduces current to 0 D diagram 2 reduces current to 2.0 A

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2018

37 A circuit contains a lamp and a fuse. There is a current of 2.0 A in the lamp and it operates normally. A fault develops in the lamp. The current in the circuit increases, and the fuse now blows. The diagrams show two circuits. diagram 1 diagram 2 Which is the circuit used and what is the effect of the fuse when it blows? circuit effect of fuse A diagram 1 reduces current to 0 B diagram 1 reduces current to 2.0 A C diagram 2 reduces current to 0 D diagram 2 reduces current to 2.0 A

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2018

38 A circuit contains a lamp and a fuse. There is a current of 2.0 A in the lamp and it operates normally. A fault develops in the lamp. The current in the circuit increases, and the fuse now blows. The diagrams show two circuits. diagram 1 diagram 2 Which is the circuit used and what is the effect of the fuse when it blows? circuit effect of fuse A diagram 1 reduces current to 0 B diagram 1 reduces current to 2.0 A C diagram 2 reduces current to 0 D diagram 2 reduces current to 2.0 A

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2018

38 The diagram shows the connections to an electric heater. The circuit includes three fuses. heater plastic fuse 1 case live fuse 3 fuse 2 neutral Which of the fuses are correctly placed? A fuse 1, fuse 2 and fuse 3 B fuse 1 and fuse 2 only C fuse 1 only D fuse 2 only

1 marks

Answer: C

This question in 0654/22 May/June 2019

38 An electrical extension block has four sockets, a cable which can safely take a current of 6 A and a plug. It is protected by a fuse rated at 5 A. The extension block is used with four appliances and the 5 A fuse blows. The owner replaces the 5 A fuse with a 13 A fuse. Why is the extension block now dangerous? A The appliances may overheat before the fuse blows. B The cable may overheat before the fuse blows. C The sockets may burn out before the fuse blows. D The 13 A fuse may blow too soon.

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2019

38 An electrical extension block has four sockets, a cable which can safely take a current of 6 A and a plug. It is protected by a fuse rated at 5 A. The extension block is used with four appliances and the 5 A fuse blows. The owner replaces the 5 A fuse with a 13 A fuse. Why is the extension block now dangerous? A The appliances may overheat before the fuse blows. B The cable may overheat before the fuse blows. C The sockets may burn out before the fuse blows. D The 13 A fuse may blow too soon.

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2019

37 An electrical extension block has four sockets, a cable which can safely take a current of 6 A and a plug. It is protected by a fuse rated at 5 A. The extension block is used with four appliances and the 5 A fuse blows. The owner replaces the 5 A fuse with a 13 A fuse. Why is the extension block now dangerous? A The appliances may overheat before the fuse blows. B The cable may overheat before the fuse blows. C The sockets may burn out before the fuse blows. D The 13 A fuse may blow too soon.

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2019

39 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 0654/21 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 0654/22 May/June 2020

37 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 0654/23 May/June 2020

38 An electric kettle is designed so that the usual current in its heater is 9.0 A. The owner of the kettle fits the plug with a fuse rated at 3 A. What happens when the kettle is filled with water and switched on? A The current in the circuit increases to greater than 9.0 A. B The fuse blows immediately and the kettle fails to operate. C The water reaches boiling point more quickly due to an increase in the voltage. D The water reaches boiling point more slowly due to a decrease in the current.

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2020

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 A fuse produces a current of exactly 3 A in the circuit. D A 3 A fuse produces a minimum current of 3 A in the circuit.

1 marks

Answer: A

This question in 0654/23 Oct/Nov 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 0654/21 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 0654/22 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 0654/23 May/June 2021

38 A hairdryer is protected by a 10 A fuse. What is the purpose of the fuse? A It decreases the current in the hairdryer to 10 A when the current is more than 10 A. B It increases the current in the hairdryer to 10 A when the current is less than 10 A. C It maintains a constant temperature in the hairdryer. D It melts when the current in the hairdryer is greater than 10 A.

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2021

37 An electrical extension block has four sockets, a cable which can safely take a current of 6 A and a plug. It is protected by a fuse rated at 5 A. The extension block is used with four appliances and the 5 A fuse blows. The owner replaces the 5 A fuse with a 13 A fuse. Why is the extension block now dangerous? A The appliances may not receive enough current. B The cable may overheat before the fuse blows. C The sockets may burn out before the fuse blows. D The 13 A fuse may blow too soon.

1 marks

Answer: B

This question in 0654/22 Feb/March 2022

37 Which row shows how lamps are connected in a lighting circuit in a house and gives an advantage of connecting them in this way? how lamps are advantage of connecting connected them in this way A in parallel they can be switched separately B in parallel they share the voltage C in series they can be switched separately D in series they share the voltage

1 marks

Answer: A

This question in 0654/21 May/June 2022

38 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 0654/21 Oct/Nov 2022

38 The maximum current in a food mixer during normal use is 3.1 A. What is the most suitable rating for a fuse used to protect the mixer? A 1 A B 3 A C 5 A D 8 A

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2022

38 A device that is designed to protect a circuit contains a thin wire. When there is a large current in the circuit, the thin wire melts and cuts off the supply. What is the device? A fuse B lamp C resistor D thermistor

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2022

38 The current in an electric heater is 10 A when in normal use. The heater circuit contains a fuse. What is the purpose of the fuse and what is a suitable rating for the fuse? suitable fuse purpose of fuse rating / A A maintains a constant current 9 B maintains a constant current 13 C protects the circuit from the effects of overheating 9 D protects the circuit from the effects of overheating 13

1 marks

Answer: D

This question in 0654/22 Feb/March 2023

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 0654/21 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 0654/21 Oct/Nov 2023

38 What is the purpose of a fuse in an electric circuit? A to make the circuit more efficient B to protect the circuit from damage by a large current C to provide a constant current in the circuit D to provide a constant potential difference (p.d.) across the circuit

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2023

38 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 0654/22 Feb/March 2024

38 What is the function of a fuse in a circuit? A It decreases the resistance of the circuit. B It ensures a constant current in the circuit. C It ensures a constant resistance in the circuit. D It prevents the cables from overheating.

1 marks

Answer: D

This question in 0654/22 May/June 2024

37 A heater circuit is protected by a 10 A fuse. How does the fuse protect the circuit? A It cuts off the current when the current in the heater is greater than 10 A. B It decreases the current in the heater to 10 A when the current is more than 10 A. C It increases the current in the heater to 10 A when the current is less than 10 A. D It maintains a constant temperature in the heater.

1 marks

Answer: A

This question in 0654/23 May/June 2024

38 The instructions for a household lamp state that the plug must be fitted with a 3 A fuse. What happens if a 13 A fuse is fitted by mistake? A The fuse blows too easily. B The lamp lights less brightly. C The wires connecting the lamp to the plug overheat if a fault develops. D Too much voltage is supplied to the lamp.

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2024

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 0654/22 Oct/Nov 2024

37 An electric motor is connected to a power supply by insulated wires. The circuit is protected by a fuse, but the wires become hot. + power M motor supply – Which change prevents the wires from becoming so hot? A Connect a second identical fuse in the circuit. B Use a fuse with a higher current rating. C Use thicker connecting wires. D Use thicker insulation on the connecting wires.

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2024