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CAIE A-Level Physics AS 9.2 Potential Difference and Power Questions

Practise relating potential difference to energy per charge with V = W/Q, choosing power formulae and comparing circuit energy transfer.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • define and calculate potential difference as energy transferred per unit charge using V = W/Q
  • calculate electrical power with P = VI, P = I²R or P = V²/R and choose the appropriate form
  • compare energy and power transfer in components using voltage, current, resistance and time

Covered syllabus points

9.2.1—The potential difference across a component as the energy transferred per9.2.2—V = W / Q9.2.3—P = VI, P = I 2R and P = V 2 / R

Question 1

[Maximum number: 1]

What is the definition of potential difference across a component?

A

energy transferred per unit charge

B

energy transferred per unit current

C

energy transferred per unit distance

D

energy transferred per unit time

Question 2

[Maximum number: 1]

Which quantity is given by the product of charge and electric potential difference?

A

current

B

energy transferred

C

power dissipated

D

resistance

Question 3

[Maximum number: 1]

The diagram shows four identical resistors connected in a circuit.
Which resistor dissipates the most power?

Figure for Question 3 — CAIE A-Level Physics AS
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