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CIE iGCSE Co-Ordinated Science P4.2.3 Voltage (electromotive force and potential difference) Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

What is defined in terms of the electrical work done by a source in moving unit charge around a complete circuit?

A. electromotive force (e.m.f.)
B. current
C. potential difference (p.d.)
D. power

▶️ Answer/Explanation
Electromotive force (e.m.f.) is defined as the electrical work done by a source in moving a unit charge around a complete circuit. This is different from potential difference (p.d.), which is the work done by a unit charge passing between two points in a circuit. Current is the rate of flow of charge, and power is the rate of energy transfer, so they do not match this definition. The definition specifically refers to the source doing work around a complete circuit, which is the key distinction for e.m.f.
✅ Answer: (A)

Question

The electromotive force (e.m.f.) of a battery is 2.0V.

Which statement is correct?
(A) The battery supplies 0.50 J of energy for every 1.0 C of charge driven around a circuit.
(B) The battery supplies 0.50 J of energy for every 2.0 C of charge driven around a circuit.
(C) The battery supplies 2.0 J of energy for every 1.0 C of charge driven around a circuit.
(D) The battery supplies 2.0 J of energy for every 2.0 C of charge driven around a circuit.

▶️Answer/Explanation

Ans: C

Question

The potential difference (p.d.) across a 60 Ω resistor is 12V.

How much time does it take for a charge of 100 C to pass through the resistor?
(A) 0.0020 s               (B) 0.050 s                  (C) 20 s                        (D) 500 s

▶️Answer/Explanation

Ans: D

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 e.m.f. of a battery is the energy supplied per unit charge. For a 2.0 V battery, it supplies 2.0 J of energy for every 1.0 C of charge driven around the circuit.

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