Which component stores energy in an electric field and is commonly used in rectifier circuits?

Which component stores energy in an electric field and is commonly used in rectifier circuits?

• A. Inductors
• B. Resistors
• C. Capacitors
• D. Diodes

Answer: (C)

Storing energy in an electric field is what a capacitor does. A capacitor has two conductive plates separated by a dielectric; when a voltage is applied, charge builds up on the plates and an electric field exists in the space between them, storing energy as W = 1/2 C V^2. In rectifier circuits, this capacitor-based energy storage smooths the DC output by charging up to the peaks of the rectified voltage and then discharging when the input falls, reducing ripple. Other components don’t store energy in an electric field in the same way: inductors store energy in a magnetic field, resistors mainly dissipate energy as heat, and diodes control current flow without storing significant energy.

Storing energy in an electric field is what a capacitor does. A capacitor has two conductive plates separated by a dielectric; when a voltage is applied, charge builds up on the plates and an electric field exists in the space between them, storing energy as W = 1/2 C V^2. In rectifier circuits, this capacitor-based energy storage smooths the DC output by charging up to the peaks of the rectified voltage and then discharging when the input falls, reducing ripple. Other components don’t store energy in an electric field in the same way: inductors store energy in a magnetic field, resistors mainly dissipate energy as heat, and diodes control current flow without storing significant energy.