CIE iGCSE Co-Ordinated Science P4.2.3 Voltage (electromotive force and potential difference) Exam Style Questions Paper 1
Question
For which quantities is the unit the volt?
(A) current and potential difference (p.d.)
(B) electromotive force (e.m.f.) and potential difference (p.d.)
(C) electromotive force (e.m.f.) and resistance
(D) potential difference (p.d.) and resistance
▶️Answer/Explanation
Ans: B
Question
The electromotive force (e.m.f.) of a battery is 2.0 V. Which statement is correct?
A. The battery supplies 0.50 J of energy for every 1.0 C of charge driven around the circuit.
B. The battery supplies 0.50 J of energy for every 2.0 C of charge driven around the circuit.
C. The battery supplies 2.0 J of energy for every 1.0 C of charge driven around the circuit.
D. The battery supplies 2.0 J of energy for every 2.0 C of charge driven around the circuit.
▶️Answer/Explanation
Answer: C
Explanation: The electromotive force (e.m.f.) is the energy supplied per unit charge. If the e.m.f. is 2.0 V, it means the battery supplies 2.0 J of energy for every 1.0 C of charge. Therefore, the correct answer is C.