Red Seal Appliance Service Technician Practice Exam

What is the common voltage for most residential dryers?

1. 120 volts

2. 240 volts

3. 300 volts

4. 360 volts

The correct answer is: 240 volts

Most residential dryers operate on a common voltage of 240 volts. This higher voltage is necessary to power the heating elements that generate the heat required for drying clothes efficiently. Unlike lighter appliances that can run on standard household voltage of 120 volts, dryers require this elevated voltage to ensure they can handle the load needed for their operation without tripping breakers or experiencing inadequate heating. The use of 240 volts in residential dryers is essential for providing the required power, as these units often have significant energy demands compared to smaller appliances. This voltage level supports the efficient running of the motor and heating elements, enabling quicker drying times. The other voltages listed do not align with typical residential dryer requirements. Standard household outlets are designed for 120 volts, which is not sufficient for dryers. Voltages of 300 and 360 volts are not standard for residential applications and are usually found in specific industrial or commercial settings. This makes 240 volts the proper and expected voltage for most residential dryers.