Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Electricity
249 practice questions
Topics covered
Practice questions
111–120 of 121 · Easy
Question 111
2 marks · Easy
Answer and see the solution →Explain why walking across a carpet and then touching a metal door handle can cause you to feel a small shock.
(a)[1 mark]What happens to your body as you walk across the carpet?
(b)[1 mark]Why do you feel a shock when you touch the metal handle?
Question 112
4 marks · Easy
Answer and see the solution →A plastic ruler is rubbed with a woollen cloth. It is then held near small pieces of paper, which jump towards the ruler. Later, this ruler is used to paint-spray a metal lamp using electrostatic paint spraying.
(a)[2 marks]Explain why the plastic ruler becomes charged when rubbed with the woollen cloth.
(b)[1 mark]State what happens to the electrons during this process.
(c)[1 mark]Explain why the electrostatic paint is attracted to the metal lamp after being sprayed.
Question 113
4 marks · Easy
Answer and see the solution →A student uses a plastic rod and a small piece of paper in an investigation. After rubbing the rod, he observes the paper is attracted to the rod. In another experiment, the rod is brought close to another charged rod, and they repel each other.
(a)[1 mark]State one property that both the plastic rod and the paper must have for the first experiment to work.
(b)[2 marks]Describe how the small piece of paper is attracted to the charged rod, even though the paper is uncharged at first.
(c)[1 mark]Explain why the two rods repel each other in the second experiment.
Question 114
4 marks · Easy
Answer and see the solution →An inkjet printer uses electrostatics to direct charged ink droplets onto paper. At the same time, a student is warned not to touch computer parts directly because of static electricity.
(a)[2 marks]Describe how static electricity is used to control where ink lands in an inkjet printer.
(b)[1 mark]Explain one way static electricity could damage computer components.
(c)[1 mark]State one precaution workers can take to avoid damage due to static electricity when handling electronics.
Question 115
4 marks · Easy
Answer and see the solution →During refuelling, an aircraft is connected to earth with a metal cable. At the same time, a gold leaf electroscope is used to show the effect of bringing a charged rod near its metal plate.
(a)[2 marks]Explain why an aircraft is earthed before refuelling.
(b)[2 marks]Describe what happens to the gold leaf if a positively charged rod is brought close to the metal plate of the electroscope.
Question 116
3 marks · Easy
Answer and see the solution →A heater is switched on for 10 minutes with a current of 2 A flowing through it. The voltage across it is 120 V.
(a)[2 marks]Calculate the total charge that passes through the heater during this time.
(b)[1 mark]State the SI unit for electric charge.
Question 117
3 marks · Easy
Answer and see the solution →A student describes a domestic plug as having a live wire, a neutral wire, and an earth wire.
(a)[1 mark]Give the function of the earth wire in a plug.
(b)[2 marks]Explain why the case of some electrical appliances is made from plastic.
Question 118
3 marks · Easy
Answer and see the solution →A kettle operates at 2000 W when supplied with a voltage of 250 V.
(a)[2 marks]Calculate the current drawn by the kettle.
(b)[1 mark]State how the electrical energy supplied to the kettle is transferred.
Question 119
3 marks · Easy
Answer and see the solution →A 12 Ω resistor is connected to a 6 V battery.
(a)[2 marks]Calculate the current through the resistor.
(b)[1 mark]State the equation linking current, voltage and resistance.
Question 120
4 marks · Easy
Answer and see the solution →An electric heater has a current of 3 A flowing when it is connected to a 230 V supply. It is left on for 10 seconds.
(a)[1 mark]State the units for current, voltage and charge.
(b)[1 mark]Calculate the power of the heater.
(c)[1 mark]Calculate the total charge that flows through the heater in 10 seconds.
(d)[1 mark]How much energy is transferred by the heater in this time?