What SI units are used to measure power?

Question

65990 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2014-03-28T18:59:44

The SI unit for power is the watt.

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"#