Power Questions In Electric Circuits II

Power calculations in electric circuits. Calculation of the power in any resistor in series and parallel circuits. Application of the power formulas. Solved Questions II.


Question 1

Power_test2_img1


In the circuit shown in the figure, R1 = 3 Ω, R2 = 15 Ω, R3 = 6 Ω, R4 = 12 Ω, R5 = 2 Ω, R6 = 4Ω


The power on the resistor R6 is 16 W.

How many amperes is the current flowing throuh resistor R3?

A) 2                 B) 3                 C) 4,2

D) 4,8              E) 5,2


Question 2

Power_test2_img2


In the circuit shown in the figure above, R1 = 6 Ω, R2 = 4 Ω, R3 = 6 Ω, R4 = 12 Ω, R5 = 4 Ω, R6 = 5 Ω, R7 = 20 Ω, R8 = 6 Ω

Power in the resistor R3 is 24 W.

How many volts is the voltage of the supply source of the circuit?


A) 60                   B) 76               C) 80

D) 102                 E) 120


Question 3

Power_test2_img3


In the circuit shown in the figure above, R1 = 3 Ω, R2 = 5 Ω, R3 = 7.2 Ω, R4 = 12 Ω, R5 = 8 Ω, R6 = 2 Ω, R7 = 6 Ω, R8 = 4 Ω, R9 = 1.6 Ω

How many watts is the power (P8) that on the resistor R8?

A) 5,2                   B) 8,65                   C) 10,24

D) 15,5                 E) 18,32


Question 4

Power_t2slq4


In the circuit shown in the figure above, R1 = 12 Ω, R2 = 18 Ω, R3 = 14 Ω, R4 = 12 Ω, R5 =4 Ω, R6 = 2 Ω, R7 = 5 Ω, R8 = 8 Ω

The internal resistance of the generator is insignificant.

How many Watts is the power drawn from the supply source?


A) 120                   B) 144               C) 160

D) 172                   E) 180


Question 5

Three resistors each with a value of 16 Ohms are connected in parallel with a battery and a circuit is created. All three of the resistor are parallel to each other and to the source.

If a resistor of 8 Ohm is connected to these resistors in parallel, what do be the power drawn from the source.

A) 288 W decreases.

B) 288 W increases.

C) 160 W increases.

D) 160 W decreases. 

E) 132 W increases.


Question 6

Three resistors of 18, 12 and 3 Ohm are connected in series.

 Then these resistors is connecting to a voltage source and creating a circuit.

If a resistor with 20 Ohm connects to the circuit in parallel, what do be the power drawn from the source.


A) 60 W increases.

B) 60 W decreases.

C) 45 W decreases.

D) 45 W increases.

E) 30 W increases.



Solutions of These Questions



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November 17 2018

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