Question

A hot electric iron has a resistance of $80\Omega$ and is used on a 200 V source. The electrical energy if it is used for hours, will be

• A. $8000Wh$
• B. $2000Wh$
• C. $1000Wh$
• D. $800Wh$

Answer 1

The correct option is C $1000Wh$

The hot electric iron has resistance of 80 Ohm and it is across 200V source. So the electrical energy is given by Energy $\frac{V^2}{R}t=\frac{200\times 200\times 2}{80}=1000Wh$