Difference Between Torque and Power

What is Torque?

Torque also known as moment or moment of force is a measure of force that rotates an objec0t about its axis. For example, when you turn the knob of a door, torque is being used. Torque is a vector quantity and has both magnitude and direction. Torque is represented by the symbol τ. The torque is calculated as follows:

$\begin{array}{l}\tau =Frsin(\theta )\end{array}$

Where,

• F is the force applied
• r is the distance between the pivot and the point at which force is applied
• θ is the angle between F and r

The unit of torque is newton- meter represented as N-m or N m.

What is Power?

Power defines the rate at which work is done. The SI unit of power is Watt, named after the Scottish inventor James Watt. By definition, one watt is equal to one joule of work done per second. Power is given by the following equation:

$\begin{array}{l}P=\frac{\mathrm{\Delta }E}{\mathrm{\Delta }t}\end{array}$

Where,

• P is the power
• ∆E is the change in energy
• ∆t is the change in time

Difference between Torque and Power

Torque	Power
It is the tendency of a force to rotate an object in a particular direction.	It defines the rate of work done.
It is a vector quantity.	It is a scalar quantity.
The SI unit of torque is newton- meter (N-m).	The SI unit of power is Watt (W).
Torque can be calculated using the equation $\begin{array}{l}\tau =Frsin(\theta )\end{array}$	Power can be calculated using the equation $\begin{array}{l}P=\frac{\mathrm{\Delta }E}{\mathrm{\Delta }t}\end{array}$
Torque can be measured using a torque sensor or a torque meter.	Power can be measured using an energy meter and multimeter.

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