Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
UNITS
16 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
1 mark · Normal
Answer and see the solution →State the unit used to measure electric current.
Question 2
1 mark · Normal
Answer and see the solution →What is the symbol for the unit of voltage?
Question 3
1 mark · Normal
Answer and check →Which of these units is used to measure power?
- A.ampere
- B.volt
- C.watt
- D.ohm
Question 4
3 marks · Normal
Answer and see the solution →A student investigates an electromagnet. She measures a current of 2.0 amperes flowing through the coil when a voltage of 12.0 volts is applied.
(a)[1 mark]State the SI unit for current.
(b)[1 mark]State the SI unit for voltage.
(c)[1 mark]Calculate the electrical power supplied to the coil. Give the unit.
Question 5
1 mark · Normal
Answer and see the solution →Name the SI unit for power.
Question 6
2 marks · Normal
Answer and see the solution →Explain why it is important to use the correct SI unit when measuring electric current, voltage, and power in physics experiments.
Question 7
2 marks · Normal
Answer and see the solution →A light bulb is connected to a power supply. The supply provides a voltage of 6.0 V, and a current of 0.40 A passes through the bulb. Calculate the power delivered to the bulb. Give your answer to 2 significant figures and include the correct unit.
Question 8
3 marks · Normal
Answer and see the solution →The table below shows measurements taken from different electrical devices.
Voltage and current for three devices. Device Voltage (V) Current (A) Fan 230 0.30 Lamp 12 0.50 Heater 120 1.50 For each device, calculate the power consumption. Write your answers with units.
(a)[1 mark]Fan
(b)[1 mark]Lamp
(c)[1 mark]Heater