An electric iron of resistance $20 \Omega$ draws a current of 5 A . The heat developed in the iron i

Question

An electric iron of resistance $20 \Omega$ draws a current of 5 A . The heat developed in the iron in 30 seconds is\

Professor PC Thomas Classes · Answer

(a) : Given : current, $I=5 \mathrm{~A}$ Time, $t=30 \mathrm{~s}$\ Resistance, $R=20 \Omega$\ Heat developed, $H=I^{2} R t$ $$ \begin{aligned} & =(5)^{2} 	imes 20 	imes 30 \ & =15000 \mathrm{~J} \end{aligned} $$