What is the standard SI unit used for power?

The standard SI unit of power is the watt (W).

Definition:
One watt is defined as the rate at which one joule of energy is used or transferred per second.

Formula:
1 Watt = 1 Joule / second (1 W = 1 J/s)

In electrical terms:
Power can also be calculated using:

• P = V × I
  Where:
• P = power (watts)
• V = voltage (volts)
• I = current (amperes)

Common multiples of watt:

• Kilowatt (kW) = 1000 W
• Megawatt (MW) = 1,000,000 W

Practical examples:

• A 60 W bulb consumes 60 joules of energy per second
• Household electricity usage is measured in kilowatt-hours (kWh)

In simple terms:
Power measures how fast electrical energy is used, and its SI unit is the watt.