Question

A $1250W$ heater operates at $115V$. What is the resistance of the heating coil (in ohm)?

• A. $1.6$
  
• B. $13.5$
  
• C. $1250$
  
• D. $10.6$
  

Answer 1

The correct option is D $10.6$

Power of the heater $P=1250W$

Operating voltage $V=115$ volts

Thus resistance of heating coil $R=\frac{V^2}{P}$

$⟹$ $R=\frac{(115{)}^2}{1250}=10.6\Omega$