Electricity Practice Questions
WAEC (West Africa) · WAEC Physics · 122 free MCQs with instant results and detailed explanations.
122
Total
31
Easy
73
Medium
18
Hard
Start Practicing Electricity
Take a timed quiz or customize your practice session
Sample Questions from Electricity
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the unit of electric current?
A.
Coulomb
B.
Volt
C.
Ohm
D.
Ampere
Show Answer & Explanation
Correct Answer: D
The unit of electric current is the Ampere, which measures the flow of electric charge.
Q2
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 Volts
C.
5 Volts
D.
7 Volts
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law, Voltage (V) = Current (I) ร Resistance (R). Thus, V = 2A ร 5ฮฉ = 10V.
Q3
Easy
Which of the following statements is true regarding series and parallel circuits?
A.
In series circuits, total resistance decreases.
B.
In parallel circuits, current is the same through all components.
C.
In series circuits, voltage is divided among components.
D.
In parallel circuits, total resistance is equal to the sum of individual resistances.
Show Answer & Explanation
Correct Answer: C
In a series circuit, the total voltage is divided among the components, while the current remains the same.
Q4
Medium
What is the resistance of a circuit if a current of 5 A flows through it when a voltage of 20 V is applied?
A.
4 ฮฉ
B.
20 ฮฉ
C.
5 ฮฉ
D.
15 ฮฉ
Show Answer & Explanation
Correct Answer: A
According to Ohm's law, Resistance (R) = Voltage (V) / Current (I). Here, R = 20 V / 5 A = 4 ฮฉ.
Q5
Medium
A 60 W bulb and a 100 W bulb are connected in parallel across a 230 V supply. Which bulb will draw more current?
A.
60 W bulb
B.
100 W bulb
C.
Both will draw the same current
D.
It depends on the voltage
Show Answer & Explanation
Correct Answer: B
Power (P) is related to current (I) and voltage (V) by the equation P = IV. The 100 W bulb will draw more current at the same voltage.
Q6
Medium
If the frequency of an AC supply is 50 Hz, what is the time period of the alternating current?
A.
0.02 seconds
B.
0.1 seconds
C.
0.5 seconds
D.
1 second
Show Answer & Explanation
Correct Answer: A
The time period (T) is the reciprocal of frequency (f). T = 1/f, so T = 1/50 Hz = 0.02 seconds.
Q7
Medium
A capacitor stores a charge of 5 ฮผC with a voltage of 10 V across it. What is the capacitance of the capacitor?
A.
0.5 ฮผF
B.
0.2 ฮผF
C.
50 ฮผF
D.
5 ฮผF
Show Answer & Explanation
Correct Answer: A
Capacitance (C) is calculated using the formula C = Q/V. Here, C = 5 ฮผC / 10 V = 0.5 ฮผF.
Q8
Hard
A circuit consists of a 12V battery connected to a resistor of 6ฮฉ. What is the current flowing through the circuit?
A.
2 A
B.
0.5 A
C.
3 A
D.
6 A
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law (V = IR), current (I) can be calculated using I = V/R. Substituting the values, I = 12V / 6ฮฉ = 2 A.
Q9
Hard
What will be the total resistance in a parallel circuit consisting of three resistors of 12ฮฉ, 24ฮฉ, and 36ฮฉ?
A.
4 ฮฉ
B.
8 ฮฉ
C.
10 ฮฉ
D.
6 ฮฉ
Show Answer & Explanation
Correct Answer: A
The total resistance (R_total) in parallel is given by 1/R_total = 1/R1 + 1/R2 + 1/R3. Therefore, 1/R_total = 1/12 + 1/24 + 1/36, which simplifies to 1/R_total = 1/4, giving R_total = 4ฮฉ.
Q10
Hard
A circuit consists of a 12 V battery connected to three resistors in series: 2 ฮฉ, 4 ฮฉ, and 6 ฮฉ. What is the total current flowing through the circuit?
A.
0.5 A
B.
1.0 A
C.
1.5 A
D.
2.0 A
Show Answer & Explanation
Correct Answer: B
To find the total current, first calculate the total resistance (R_total) in the series: R_total = R1 + R2 + R3 = 2 ฮฉ + 4 ฮฉ + 6 ฮฉ = 12 ฮฉ. Then use Ohm's law (I = V/R) to find the current: I = 12 V / 12 ฮฉ = 1 A.
Showing 10 of 122 questions. Start a quiz to practice all questions with scoring and timer.
Practice All 122 Questions →Other WAEC (West Africa) Subjects
Electricity โ WAEC (West Africa) WAEC Physics Practice Questions Online
This page contains 122 practice MCQs for the chapter Electricity in WAEC (West Africa) WAEC Physics. The questions are organized by difficulty โ 31 easy, 73 medium, 18 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.