Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
ALTERNATING CURRENT AND DIRECT CURRENT
16 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the unit of energy transferred in an electric circuit.
Question 2
1 mark · Easy
Answer and check →Which of the following best describes direct current (d.c.)?
- A.A current that constantly changes direction and size.
- B.A current that is always in the same direction with a constant value.
- C.A current that is always zero.
- D.A current that reverses direction every second.
Question 3
2 marks · Easy
Answer and see the solution →A small fan operates at a power of 10 W. How much energy does it transfer in 3 minutes?
Question 4
3 marks · Easy
Answer and see the solution →A torch uses a battery to provide electricity to a bulb.
(a)[1 mark]State whether the current from the battery is alternating current (a.c.) or direct current (d.c.).
(b)[2 marks]Give a reason for your answer.
Question 5
2 marks · Easy
Answer and see the solution →A small electric pump transfers 4800 J of energy in 4 minutes. Calculate the power of the pump.
Question 6
2 marks · Easy
Answer and see the solution →A 30 W charger is used for 2 hours.
(a)[2 marks]Calculate the total energy transferred in joules.
Question 7
1 mark · Easy
Answer and check →Which device supplies alternating current (a.c.) in a home?
- A.A torch battery
- B.A solar cell
- C.The mains electricity socket
- D.A chemical cell
Question 8
1 mark · Easy
Answer and see the solution →State the equation linking energy transferred (E), power (P), and time (t) in an electric circuit.