Question

the resistance of resistor is reduced to half of its initial value.in doing so,if other parameters of the circuit remain unchanged,the heating effect in the resistor will becom?​

Answer 1

Answer: (B) half

Explanation:

Bcoz Heat is directly proportional to Resistance

Answer 2

Given :

Initial resistance = R

Final resistance = R/2

To find :

The heat produced in the resistor

Solution :

• Heat generated in the resistor (H) = V²/R

• Heat generated initially = V²/R = H

• Het generated after changing resistance = V²/(R/2)

                                                                     = 2V²/R   = 2H

The heat produced will be doubled if resistance is reduced to half