Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Electricity
249 practice questions
Topics covered
Practice questions
231–240 of 249
Question 231
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 232
2 marks · Normal
Answer and check →A student rubs a balloon on their hair and the balloon sticks to a wall. Which statement best explains this?
- A.The wall becomes positively charged and attracts the negatively charged balloon.
- B.Electrons move from the balloon to the wall, so both have the same charge.
- C.The wall loses protons to the balloon, making the balloon positive.
- D.The balloon becomes positively charged and is repelled by the wall.
Question 233
6 marks · Normal
Answer and see the solution →A student investigates materials for electrostatic paint spraying. She rubs a plastic rod with a woollen cloth, then uses the rod to try to move small pieces of aluminium foil. Next, she describes how electrostatic spraying works to paint car parts efficiently.
(a)[2 marks]Explain, using ideas about electrons, how rubbing the rod with the cloth causes them to become charged.
(b)[2 marks]The student finds the aluminium foil is attracted to the charged rod. State whether the foil must be charged or uncharged, and explain your answer.
(c)[2 marks]Describe how electrostatic paint spraying makes painting more efficient than using an ordinary spray.
Question 234
5 marks · Normal
Answer and see the solution →A science class uses plastic drinking straws to investigate static forces. First, they identify which straw materials are conductors and which are insulators. Then, they compare how a charged straw interacts with both an uncharged straw and a suspended, previously-rubbed straw.
(a)[2 marks]Describe how you could use a simple circuit with a bulb to determine whether a straw is an electrical conductor or an insulator.
(b)[1 mark]The students suspend an uncharged plastic straw and bring a second, charged plastic straw near it. What will happen? Explain your answer.
(c)[2 marks]Next, both straws are rubbed with the same cloth so they gain the same charge. Predict and explain the observation when one is brought close to the other.
Question 235
5 marks · Normal
Answer and see the solution →Static electricity can be helpful but also dangerous. Consider the uses and dangers of static charges in everyday life.
(a)[2 marks]Explain why fuel tankers are earthed before transferring fuel.
(b)[3 marks]Give two different situations where static electricity is used to solve a practical problem. For each, briefly explain how static charges are involved.
Question 236
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 237
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 238
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 239
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 240
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?