JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Heat produced (cals) in a resistance

R

when a current

I

amperes flows through it for

t

seconds is given by the expression

View answer and explanation

Correct option: A

\frac{{{I^2}Rt}}{{4.2}}

Option A (

\frac{{{I^2}Rt}}{{4.2}}

) is correct because this formula correctly converts electrical energy (in Joules) to heat energy (in calories) using the mechanical equivalent of heat (4.2 J/cal).

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