# Electric Circuits Questions and Answers – The Voltage Divider and Current Divider Circuits

This set of Electric Circuits Questions and Answers for Freshers focuses on “The Voltage Divider and Current Divider Circuits”.

1. Where voltage division problem arises
a) Series connected resistors
b) Parallel connected resistors
c) When resistors are equal
d) Both series and parallel resistors.

Explanation: In series, voltage is the difference and current same.

2. Where current division problem arises
a) Series connected resistors
b) Parallel connected resistors
c) When resistors are equal
d) Both series and parallel resistors.

Explanation: In parallel voltage is same and current is the difference.

3. If there are 3 Resistors R1, R2 and R3 in series and V is total voltage and I is total current then Voltage across R2 is
a) V R3/ R1 + R2 + R3
b) V R2/ R1 + R2 + R3
c) V R1/R1 + R2 + R3
d) V

Explanation: V2 =I R2
= V R2/ R1 + R2 + R3.

4. Calculate Voltage across 2Ω Resistor where supply v= 10volts.

a) 2V
b) 3V
c) 10V
d) 4V

Explanation: I = 10/5 = 2A
V2 = 10(2)
V2 = I.R2
= 2(2)
4V.

5. Calculate i =?

a) -1A
b) +2A
c) 8A
d) -5A

Explanation: i = 1/1+3(8)
= 2A.

6. For a parallel connected resistor R1, R2 and a voltage of V volts. Current across the first resistor is given by
a) I R1
b) I R2
c) I R1 / R1 + R2
d) I R2 / R1 + R2

Explanation: I1 = V / R1
R = R1. R2 / R1 + R2
= I . R1. R2 / R1 . R1 + R2
I1 = I R2 / R1 + R2.

7. R1 = 1Ω, R2 = 3Ω, R3 = 5Ω and R4 = 7Ω connected in series. Total voltage = 20V, Current I, V2 =?
a) I = 1.23, V2 = 3.75
b) I = 1.25, V2 = 3.75
c) I = 1.15, V2= 3.73
d) I = 1.16, V2 = 3.72

Explanation: I = 20/ 1 + 3 + 5 + 7 = 1.25A
V2 = V. R2 / R1 + R2 + R3 + R4
= 20(3)/16
= 3.75V.

8. R1 = 1Ω, R2 = 3Ω, R3 = 5Ω and R4 = 7Ω connected in parallel. Total Current = 23A. Then V, I1 , I2 =?
a) 12.26v, 1.725, 2.875
b) 12.23v, 2.875, 1.725
c) 11.26v, 1.95, 1.74
d) 11.23v, 1.74, 1.95

Explanation: V = I/R
V = I (R1 + R2) R1 R2 = 12.26v
I1 = IR2/ R1 + R2 = 1.725A
I2 = IR1/ R1 + R2
= 2.875A.

9. Voltage division is necessary for parallel resistance networks
a) True
b) False

Explanation: In parallel, connection voltage is same so no division is required.

10. Why is current division necessary?
a) In series current is the same
b) In parallel current differs
c) Because the voltage is also different
d) Because of Kirchhoff’s laws.

Explanation: In parallel current differs.

Sanfoundry Global Education & Learning Series – Electric Circuits.

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