What is the SI unit of electrical power?

What is the SI unit of electrical power?

• A. Watt
• B. Volt
• C. Ampere
• D. Ohm

Answer: (A)

Electrical power is the rate at which energy is transferred in a circuit, and its SI unit is the watt. One watt equals one joule per second, and in circuits power is commonly calculated as P = V × I, where voltage is measured in volts and current in amperes. This shows why the watt is used for power: it directly ties the energy transfer rate to the electrical quantities that drive it. For example, at 60 volts with a current of 4 amperes, you’re delivering 240 watts of power. The other quantities—voltage (volts), current (amperes), and resistance (ohms)—describe different aspects of the circuit, not power itself.

Electrical power is the rate at which energy is transferred in a circuit, and its SI unit is the watt. One watt equals one joule per second, and in circuits power is commonly calculated as P = V × I, where voltage is measured in volts and current in amperes. This shows why the watt is used for power: it directly ties the energy transfer rate to the electrical quantities that drive it. For example, at 60 volts with a current of 4 amperes, you’re delivering 240 watts of power. The other quantities—voltage (volts), current (amperes), and resistance (ohms)—describe different aspects of the circuit, not power itself.