Electricity Practice Questions
GCSE · GCSE Physics · 134 free MCQs with instant results and detailed explanations.
134
Total
35
Easy
70
Medium
29
Hard
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Sample Questions from Electricity
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Q1
Easy
If a resistor has a resistance of 5 ohms and a current of 2 amperes flows through it, what is the voltage across the resistor?
A.
10 volts
B.
2.5 volts
C.
5 volts
D.
15 volts
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law (V = I ร R), where V is voltage, I is current, and R is resistance, we calculate V = 2A ร 5ฮฉ = 10 volts.
Q2
Easy
Which of the following materials is a good conductor of electricity?
A.
Wood
B.
Copper
C.
Rubber
D.
Glass
Show Answer & Explanation
Correct Answer: B
Copper is a good conductor of electricity because it allows electric charges to flow easily, whereas wood, rubber, and glass are insulators.
Q3
Easy
What unit is electrical resistance measured in?
A.
Ohms
B.
Volts
C.
Amperes
D.
Watts
Show Answer & Explanation
Correct Answer: A
Electrical resistance is measured in Ohms, which is the standard unit recognized in the International System of Units (SI).
Q4
Medium
What is the total resistance in a series circuit with a 5 ฮฉ resistor, a 10 ฮฉ resistor, and a 15 ฮฉ resistor?
A.
30 ฮฉ
B.
10 ฮฉ
C.
15 ฮฉ
D.
5 ฮฉ
Show Answer & Explanation
Correct Answer: A
In a series circuit, the total resistance is the sum of the individual resistances. Therefore, 5 ฮฉ + 10 ฮฉ + 15 ฮฉ = 30 ฮฉ.
Q5
Medium
A 12 V battery is connected to a circuit with a resistance of 4 ฮฉ. What is the current flowing through the circuit?
A.
3 A
B.
2 A
C.
4 A
D.
1 A
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law (V = IR), current (I) can be calculated as I = V/R. Here, I = 12 V / 4 ฮฉ = 3 A.
Q6
Medium
Which of the following devices is used to measure electric current?
A.
Voltmeter
B.
Oscilloscope
C.
Ammeter
D.
Resistor
Show Answer & Explanation
Correct Answer: C
An ammeter is specifically designed to measure the flow of electric current in a circuit, unlike voltmeters or oscilloscopes which serve different purposes.
Q7
Medium
In a parallel circuit, if one branch has a 6 ฮฉ resistor and the other branch has a 12 ฮฉ resistor, what is the equivalent resistance?
A.
4 ฮฉ
B.
8 ฮฉ
C.
2 ฮฉ
D.
3 ฮฉ
Show Answer & Explanation
Correct Answer: A
For resistors in parallel, the formula is 1/R_total = 1/R1 + 1/R2. Therefore, 1/R_total = 1/6 + 1/12, which simplifies to R_total = 4 ฮฉ.
Q8
Hard
A circuit consists of a 12V battery connected in series with a 4ฮฉ resistor and a 2ฮฉ resistor. What is the total current flowing through the circuit?
A.
2A
B.
3A
C.
4A
D.
6A
Show Answer & Explanation
Correct Answer: B
The total resistance in a series circuit is the sum of the resistances. Here, R_total = 4ฮฉ + 2ฮฉ = 6ฮฉ. Using Ohm's law (I = V/R), the total current is I = 12V / 6ฮฉ = 2A.
Q9
Hard
In an electric circuit, a power supply delivers a power of 60W at a potential difference of 12V. What is the current flowing through the circuit?
A.
3A
B.
5A
C.
12A
D.
15A
Show Answer & Explanation
Correct Answer: B
Power (P) is calculated using the formula P = V ร I. Rearranging this gives I = P / V. Substituting the known values: I = 60W / 12V = 5A.
Q10
Hard
A circuit consists of a 12V battery connected to a resistor of 4ฮฉ and a current of 3A flowing through it. What is the power dissipated by the resistor?
A.
36 W
B.
9 W
C.
12 W
D.
18 W
Show Answer & Explanation
Correct Answer: A
Power dissipated by a resistor can be calculated using the formula P = IยฒR. Here, I = 3A and R = 4ฮฉ. Therefore, P = 3ยฒ * 4 = 9 * 4 = 36W.
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Electricity โ GCSE GCSE Physics Practice Questions Online
This page contains 134 practice MCQs for the chapter Electricity in GCSE GCSE Physics. The questions are organized by difficulty โ 35 easy, 70 medium, 29 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.