Dryers
Both gas and electric clothes dryers work by heating air that is blown through a duct into a rotating drum.

A gas dryer has a gas burner that does the heating; an electric dryer has electric heating elements. Both types utilize electricity for the controls and the motor that turns the drum.

You'll want to take great care when working on dryers. Unplug the dryer and turn off the gas supply to a gas dryer at the appliance shutoff valve. If you smell a strong odor of natural gas, stop what you're doing and call the gas utility from outside the house.