CIE iGCSE Co-Ordinated Science P4.2.2 Electric current Exam Style Questions Paper 1
Question
A 6.0V battery is connected to a lamp. The current in the circuit is 0.60A.
What is the resistance of the lamp?
A 0.10 B 3.6 C 10 D 36
▶️Answer/Explanation
Ans :C
Question
A 2.0Ω resistor and a 3.0Ω resistor are connected in series with a 10V battery.
What is the current in the circuit?
A 0.50A B 2.0A C 5.0A D 50A
▶️Answer/Explanation
Ans : B
Question
A battery of e.m.f. V is connected across a resistor of resistance R. There is a current in the
resistor.
Which row shows two changes that both increase the current in the resistor?
▶️Answer/Explanation
Ans : C
Question
What is a current in a metal wire?
(A) a flow of electrons
(B) a flow of ions
(C) a flow of neutrons
(D) a flow of protons
▶️Answer/Explanation
Ans: A
Question
Which two electrical quantities are measured in the same unit?
(A) current and potential difference (p.d.)
(B) current and electromotive force (e.m.f.)
(C) potential difference (p.d.) and electromotive force (e.m.f.)
(D) potential difference (p.d.) and resistance
▶️Answer/Explanation
Ans : C
Question
In the circuits shown, all the resistors are identical.
Which circuit has the smallest combined resistance?
▶️Answer/Explanation
Ans: B
Question
A lamp is connected to a 3.0V battery. The resistance of the lamp is 60 Ω.
What is the current in the lamp?
(A) 0.050 mA
(B) 20 mA
(C) 50 mA
(D) 180 mA
▶️Answer/Explanation
Ans: C
Question
The diagram shows two resistors connected in parallel to a battery. The circuit contains a voltmeter and an ammeter.
A third resistor is now connected in parallel with these two resistors.
What happens to the voltmeter reading and what happens to the ammeter reading?
▶️Answer/Explanation
Ans: D
Question
There is a battery of e.m.f. V in a circuit of total resistance R. Which pair of changes must result in a larger current in the circuit?
A. decreasing V and decreasing R
B. decreasing V and increasing R
C. increasing V and decreasing R
D. increasing V and increasing R
▶️Answer/Explanation
Answer: C. increasing V and decreasing R
Explanation: According to Ohm’s Law (V = IR), increasing the voltage (V) and decreasing the resistance (R) will result in a larger current (I).
Question
An ammeter is used to measure the current in a metal wire. Which row describes the current and how the ammeter is connected to the wire?
| Description of Current | How Ammeter is Connected |
|---|---|
| A. flow of electrons | in parallel with the wire |
| B. flow of electrons | in series with the wire |
| C. flow of protons | in parallel with the wire |
| D. flow of protons | in series with the wire |
▶️Answer/Explanation
Answer: B. flow of electrons, in series with the wire
Explanation: Current in a metal wire is the flow of electrons, and an ammeter must be connected in series to measure the current.