# Power Questions In Electric Circuits

## Topic of electric circuits. Power calculation in electric circuits. Calculating of the power in resistors connected in serie and parallel. Questions and its solutions.

**Question 1**

In the circuit shown in the figure above, R1 = 5 Ω, R2 = 5 Ω, R3 = 3 Ω, R4 = 8 Ω, R5 = 6 Ω.

Power in the resistor R2 is P2 and power in the resistor R5 is P5.

Which of the following options is equal to the sum of the P2 + P5?

A) 65 W B) 124 W C) 261 W

D) 312 W E) 375 W

**Question 2**

In the circuit shown in the figure above, R1 = 10 Ω, R2 = 6 Ω, R3 = 4 Ω, R4 = 8 Ω, R5 = 3 Ω, R6 = 9 Ω.

In the circuit shown above, power in the resistor R2 is P2 and power in the resistor R4 is P4.

Which of the following options is equal to the sum of the P2 + P4?

A) 105,84 W

B) 82,5 W

C) 76,45 W

D) 65 W

E) 56,78 W

**Question 3**

In the circuit shown in the figure above, R1 = 7 Ω, R2 = 3 Ω, R3 = 4 Ω, R4 = 8 Ω, R5 = 3 Ω, R6 = 6 Ω

The power in the resistor R1 is 63 Watt.

How many volts is the potential difference (V) of the supply source of the circuit.

A) 110 V B) 100 V C) 90 V

D) 75 V E) 60 V

**Question 4**

In the circuit shown in the figure above, R1 = 2 Ω, R2 = 6 Ω, R3 = 3 Ω, R4 = 8 Ω, R5 = 2 Ω, R6 = 4 Ω, R7 = 4 Ω, R8 = 6 Ω, R9 = 6 Ω, R10 = 6 Ω

The supply voltage is 72 V

How many Watts is the power in the resistor R5?

A) 312 W

B) 288 W

C) 244 W

D) 142 A

E) 121 W

**Question 5 **

In The circuit shown in the figure, R1 = 3 Ω, R2 = 5 Ω, R3 = 5 Ω, R4 = 12 Ω, R5 = 8 Ω.

How many watt is the power P5 in the resistor R5?

A)24 B) 16 C) 11,25

D) 5,12 E) 4,8

**Question 6**

In the circuit shown in the figure above, R1 = 4 Ω, R2 = 3 Ω, R3 = 3 Ω, R4 = 6 Ω, R5 = 2 Ω, R6 = 6 Ω, R7 = 12 Ω, R8 = 5 Ω

Potential difference of the supply source is 120 V.

How many watt is the power in the resistor R7?

A)64 B) 48 C) 42

D) 36 E) 32

**Explanatory Solutions Of These Questions**

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November 21 2018

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