Question

A hair dryer has a power rating of 1200 W at 120 V rms. Assuming the hair dryer circuit contains only resistance, what is the resistance of the heating element?

Answer 1

`12Omega`

Explanation:

Power `= VxxI=1200"W"`

`:.I=1200/120=10"A"`

The power dissipated in the resistor `=I^2R`

`:.R=1200/(10xx10)=12Omega`