Electrical power is measured in which unit, and what is the basic formula?

Electrical power is measured in which unit, and what is the basic formula?

• A. Watt; Watt = Volts x Amps
• B. Watt; Watt = Amps / Volts
• C. Watt; Watt = Volts + Amps
• D. Watt; Watt = Volts / Amps

Answer: (A)

Power in an electrical circuit is the rate at which energy is transferred, and it is measured in watts. The basic relationship is P = V × I, where P is power in watts, V is voltage in volts, and I is current in amperes. This makes sense because voltage is the potential that pushes charges, and current is the flow of charges per second; multiplying them gives the energy transferred per second. So 1 watt equals 1 volt times 1 amp. For example, at 120 volts with a current of 2 amperes, the device uses 240 watts. The other forms (adding values or dividing voltage by current) don’t describe the rate of energy transfer.

Power in an electrical circuit is the rate at which energy is transferred, and it is measured in watts. The basic relationship is P = V × I, where P is power in watts, V is voltage in volts, and I is current in amperes. This makes sense because voltage is the potential that pushes charges, and current is the flow of charges per second; multiplying them gives the energy transferred per second. So 1 watt equals 1 volt times 1 amp. For example, at 120 volts with a current of 2 amperes, the device uses 240 watts. The other forms (adding values or dividing voltage by current) don’t describe the rate of energy transfer.