Which device stores energy in an electric field and has capacitance measured in Farads?

Which device stores energy in an electric field and has capacitance measured in Farads?

• A. Capacitor
• B. Inductor
• C. Resistor
• D. Transformer

Answer: (A)

Capacitors store energy in the electric field between two conductors separated by a dielectric. The key idea is that they hold electrical charge proportional to the voltage across them, and this property is called capacitance, measured in Farads. The energy stored in a capacitor is given by E = 1/2 C V^2, so higher capacitance or higher voltage leads to more energy stored. Other devices behave differently: inductors and transformers store energy in magnetic fields and are measured in Henries, while resistors do not store energy at all—they dissipate it as heat.

Capacitors store energy in the electric field between two conductors separated by a dielectric. The key idea is that they hold electrical charge proportional to the voltage across them, and this property is called capacitance, measured in Farads. The energy stored in a capacitor is given by E = 1/2 C V^2, so higher capacitance or higher voltage leads to more energy stored.

Other devices behave differently: inductors and transformers store energy in magnetic fields and are measured in Henries, while resistors do not store energy at all—they dissipate it as heat.