Electric Circuits Practice Questions
AP (Advanced Placement) · AP Physics 2 · 150 free MCQs with instant results and detailed explanations.
150
Total
60
Easy
69
Medium
21
Hard
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Sample Questions from Electric Circuits
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Q1
Easy
What is the total resistance in a series circuit with three resistors: R1 = 2ฮฉ, R2 = 3ฮฉ, and R3 = 5ฮฉ?
A.
10ฮฉ
B.
8ฮฉ
C.
6ฮฉ
D.
5ฮฉ
Show Answer & Explanation
Correct Answer: A
In a series circuit, the total resistance is the sum of individual resistances. Thus, R_total = R1 + R2 + R3 = 2ฮฉ + 3ฮฉ + 5ฮฉ = 10ฮฉ.
Q2
Easy
If a circuit has a voltage of 12V and a total resistance of 4ฮฉ, what is the current flowing through the circuit?
A.
3A
B.
6A
C.
12A
D.
48A
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law, V = IR, we can rearrange it to find I = V/R. Substituting the values gives I = 12V / 4ฮฉ = 3A.
Q3
Easy
In a parallel circuit with two resistors, R1 = 6ฮฉ and R2 = 12ฮฉ, what is the equivalent resistance?
A.
4ฮฉ
B.
6ฮฉ
C.
8ฮฉ
D.
18ฮฉ
Show Answer & Explanation
Correct Answer: A
The formula for equivalent resistance in parallel is 1/R_eq = 1/R1 + 1/R2. Thus, 1/R_eq = 1/6 + 1/12 = 2/12 + 1/12 = 3/12, giving R_eq = 4ฮฉ.
Q4
Medium
What is the equivalent capacitance of three capacitors (C1 = 2ยตF, C2 = 3ยตF, C3 = 6ยตF) connected in parallel?
A.
11 ยตF
B.
10 ยตF
C.
9 ยตF
D.
12 ยตF
Show Answer & Explanation
Correct Answer: A
In parallel, capacitance adds directly: C_eq = C1 + C2 + C3 = 2ยตF + 3ยตF + 6ยตF = 11ยตF.
Q5
Medium
In a series circuit with a 24V battery and three resistors (R1 = 4ฮฉ, R2 = 8ฮฉ, R3 = 12ฮฉ), what is the voltage drop across R2?
A.
6V
B.
8V
C.
12V
D.
16V
Show Answer & Explanation
Correct Answer: B
First, calculate total resistance R_total = R1 + R2 + R3 = 4ฮฉ + 8ฮฉ + 12ฮฉ = 24ฮฉ. The total current I = V / R_total = 24V / 24ฮฉ = 1A. Voltage drop across R2 is V_R2 = I * R2 = 1A * 8ฮฉ = 8V.
Q6
Medium
What happens to the total resistance when two resistors are connected in series compared to when they are connected in parallel?
A.
Total resistance is higher in series.
B.
Total resistance is the same in both configurations.
C.
Total resistance is always lower in series.
D.
Total resistance is always higher in parallel.
Show Answer & Explanation
Correct Answer: A
In a series connection, total resistance is the sum of the resistances, making it higher than in parallel, where the total resistance decreases as more paths are added.
Q7
Medium
A circuit consists of a 12 V battery connected in series with a resistor of 4 ฮฉ and another resistor of 8 ฮฉ. What is the current flowing through the circuit?
A.
0.5 A
B.
1 A
C.
2 A
D.
3 A
Show Answer & Explanation
Correct Answer: B
Using Ohm's Law, the total resistance in the circuit is R_total = 4 ฮฉ + 8 ฮฉ = 12 ฮฉ. Therefore, the current (I) is given by I = V/R_total = 12 V / 12 ฮฉ = 1 A.
Q8
Hard
A circuit consists of a 12 V battery connected to two resistors, R1 = 6 ฮฉ and R2 = 12 ฮฉ, in parallel. What is the total current flowing from the battery?
A.
1 A
B.
2 A
C.
3 A
D.
4 A
Show Answer & Explanation
Correct Answer: C
In a parallel circuit, the voltage across each resistor is the same. The total current can be found using I = V/R_eff, where R_eff is the equivalent resistance. The equivalent resistance R_eff for resistors in parallel is given by 1/R_eff = 1/R1 + 1/R2. Calculating this yields R_eff = 4 ฮฉ, so I = 12 V / 4 ฮฉ = 3 A.
Q9
Hard
In a circuit containing a resistor, an inductor, and a capacitor connected in series to an AC source, how does the impedance change if the frequency of the AC source is increased?
A.
The impedance increases due to the inductive reactance increasing more than capacitive reactance.
B.
The impedance decreases due to the capacitive reactance decreasing.
C.
The impedance remains constant as frequency does not affect impedance.
D.
The impedance increases due to both inductive and capacitive reactance increasing equally.
Show Answer & Explanation
Correct Answer: A
As the frequency of the AC source increases, the inductive reactance (XL = 2ฯfL) increases while the capacitive reactance (XC = 1/(2ฯfC)) decreases. However, the increase in XL outweighs the decrease in XC, resulting in an overall increase in impedance.
Q10
Hard
In a circuit with three resistors of values R1 = 4ฮฉ, R2 = 6ฮฉ, and R3 = 12ฮฉ connected in parallel, what is the equivalent resistance of the circuit?
A.
2ฮฉ
B.
3ฮฉ
C.
4ฮฉ
D.
5ฮฉ
Show Answer & Explanation
Correct Answer: A
The equivalent resistance (R_eq) for resistors in parallel is given by 1/R_eq = 1/R1 + 1/R2 + 1/R3. Calculating gives 1/R_eq = 1/4 + 1/6 + 1/12, which simplifies to 1/R_eq = 3/12 + 2/12 + 1/12 = 6/12. Thus, R_eq = 2ฮฉ.
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Electric Circuits โ AP (Advanced Placement) AP Physics 2 Practice Questions Online
This page contains 150 practice MCQs for the chapter Electric Circuits in AP (Advanced Placement) AP Physics 2. The questions are organized by difficulty โ 60 easy, 69 medium, 21 hard โ so you can choose the right level for your preparation.
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