What is the function of a capacitor?

What is the function of a capacitor?

• A. Converts DC to AC
• B. Induces magnetic field
• C. Limits current flow
• D. Stores and releases electrical energy; used for filtering motor starts/run applications

Answer: (D)

Capacitors store energy in the electric field between two plates and can release that energy when the circuit needs it. That ability to absorb a surge of current and then supply it quickly makes them ideal for smoothing voltage and providing short bursts of power in motor start/run circuits. In motors, this stored energy helps provide the starting torque and can also help maintain steady operation by filtering voltage changes. A describes turning DC into AC, which is done by other equipment like inverters. B refers to inductors, which create magnetic fields. C describes a resistor’s job to limit current, which isn’t the primary function of a capacitor.

Capacitors store energy in the electric field between two plates and can release that energy when the circuit needs it. That ability to absorb a surge of current and then supply it quickly makes them ideal for smoothing voltage and providing short bursts of power in motor start/run circuits. In motors, this stored energy helps provide the starting torque and can also help maintain steady operation by filtering voltage changes. A describes turning DC into AC, which is done by other equipment like inverters. B refers to inductors, which create magnetic fields. C describes a resistor’s job to limit current, which isn’t the primary function of a capacitor.