Calculate power from work and time, or force and velocity. Perfect for physics students and professionals.
Power is the rate at which work is done or energy is transferred. It's measured in watts (W) and represents how quickly energy is being used or transferred.
Power = Work ÷ Time. This formula shows that power increases when more work is done in less time, or decreases when the same work takes longer.
Power = Force × Velocity. This means power increases with both the force applied and the speed at which it's applied.
The SI unit of power is the watt (W), which equals 1 joule per second. Other common units include horsepower (hp) and kilowatts (kW).
Efficiency = (Useful Power Output ÷ Total Power Input) × 100%. Higher efficiency means more of the input power is converted to useful work.