CIE iGCSE Co-Ordinated Science P4.2.2 Electric current Exam Style Questions Paper 2
Question
There is an alternating current (a.c.) in a metal wire.
Which statement about the current is correct?
(A) It is a flow of both positively and negatively charged particles.
(B) It is a flow of charged particles, first in one direction then in the opposite direction repeatedly.
(C) It is a flow of charged particles in both directions at the same time.
(D) It is a flow of charged particles steadily in one direction
▶️Answer/Explanation
Ans : B
Question
A charge of 480 C passes through a wire in 3.0 minutes.
What is the average current in the wire?
(A) 2.7A
(B) 24A
(C) 160A
(D) 1440A
▶️Answer/Explanation
Ans: A
Question
A battery with an electromotive force (e.m.f.) of 6.0 V is connected to a 30 Ω resistor. How much charge flows through the battery in 5.0 s?
A. 1.0 C
B. 25 C
C. 36 C
D. 900 C
▶️Answer/Explanation
Answer: A. 1.0 C
Explanation: The current (I) can be calculated using Ohm’s law: I = V / R = 6.0 V / 30 Ω = 0.2 A. The charge (Q) is then calculated using Q = I × t = 0.2 A × 5.0 s = 1.0 C.
Question
A circuit contains a battery, a fixed resistor, an ammeter and a variable resistor.
The reading on the ammeter is 1.8 mA.
How much charge flows through the variable resistor in 30 s?
A 0.054 C
B 17 C
C 54 C
D 17 000C
▶️Answer/Explanation
Ans :A