Question

What is heat generated in a resistor of resistance 200 $\Omega$, when 10 A current is passed through it for 20 s is _____J?

• A. 4 x ${10}^5$
• B. 2 x ${10}^5$
• C. 3 x ${10}^6$
• D. 4 x ${10}^6$

Answer 1

The correct option is A 4 x ${10}^5$

From Joule's law of heating we know that the heat produced in a current carrying resistor in time t is given by

Heat=$H=i^{2}Rt$

$={10}^2\times 200\times 20$

$=4\times {10}^{5}J$

Answer-(A)