Which electrical quantity is defined as the measure of available energy in a circuit?

Which electrical quantity is defined as the measure of available energy in a circuit?

• A. Resistance
• B. Capacitance
• C. Voltage
• D. Amperage

Answer: (C)

Voltage represents the potential energy per unit charge that is available to do work in a circuit. It’s the driving force that pushes electrons to move through components, supplying the energy that current can deliver. Resistance describes how much a component impedes current and dissipates energy as heat, not the amount of energy available. Capacitance tells you how much charge a component can store at a given voltage, and the actual energy stored depends on both capacitance and voltage, but the quantity that measures the energy available to perform work is the potential difference itself. Amperage is the rate at which charge flows, not the total energy available.

Voltage represents the potential energy per unit charge that is available to do work in a circuit. It’s the driving force that pushes electrons to move through components, supplying the energy that current can deliver. Resistance describes how much a component impedes current and dissipates energy as heat, not the amount of energy available. Capacitance tells you how much charge a component can store at a given voltage, and the actual energy stored depends on both capacitance and voltage, but the quantity that measures the energy available to perform work is the potential difference itself. Amperage is the rate at which charge flows, not the total energy available.