Rectification helps appliances run at cooler temperatures and allows them to run at variable speeds.

Rectification helps appliances run at cooler temperatures and allows them to run at variable speeds.

• A. Cooler and Fixed
• B. Warmer and Variable
• C. Cooler and Variable
• D. Warmer and Fixed

Answer: (C)

Rectification turns AC into DC, which lets you feed motors and other circuits with steady, controllable current. When you provide DC power, you can adjust the voltage (or use PWM) to change the motor speed. Lowering the voltage reduces current and heating, so the appliance runs cooler, while also allowing operation at different speeds. That combination—cooler operation and variable speeds—fits this option best.

Rectification turns AC into DC, which lets you feed motors and other circuits with steady, controllable current. When you provide DC power, you can adjust the voltage (or use PWM) to change the motor speed. Lowering the voltage reduces current and heating, so the appliance runs cooler, while also allowing operation at different speeds. That combination—cooler operation and variable speeds—fits this option best.