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  • In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be (a) 5 J (b) 10 J (c) 20 J (d) 30 J

In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be 

(a) 5 J 

(b) 10 J 

(c) 20 J 

(d) 30 J

Answers (1)

Answer: (c)

Solution:

Given resistors are 4\Omega ,2\Omega are connected in series

Equivalent Resistance = 4\Omega +2\Omega =6\Omega

Voltage = 6V

Current in the resistor = V/R = 6/6 = 1 A

Heat dissipated in resistor = I2Rt=12×4×5=20J

Therefore, option (c) is correct.

Posted by

infoexpert24

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