Question

What SI units are used to measure power?

Answer 1

The SI unit for power is the watt.

Explanation:

The watt (W) is the SI derived unit for power. It comes from the SI base units.

Velocity is the rate at which an object travels.

`v = "distance"/"time" = d/t`.

The units of velocity are metres per second (m/s).

Acceleration is the rate at which an object changes its velocity.

`a = v/t`.

The units of acceleration are metres per second squared (`"m·s"^"-2"`).

Force is any influence that tends to change the motion of an object. Force = mass × acceleration.

`f = ma`.

The newton (N) is the force needed to accelerate up a mass of 1 kg by `"1 m·s"^"-2"`.

`"1 N = 1 kg·m·s"^"-2"`

Work is the action of a force through a distance.

`w = f × d`.

The units of work are `"kg·m"^2"s"^"-2"` or `"N·m"`.

Energy is the ability to do work. It has the same units as work. The SI unit for energy is the joule (J). `"1 J = 1 N·m"`.

Power is the measure of how much energy or work is used per unit time.

`"Power" = "energy"/"time"`

The SI unit of power is joules per second (J/s) or Watts (W).

In summary,

`"1 W = 1 J/s = 1 N·m/s = 1 kg·m"^2·"s"^"-3"`