Question

Power is a scalar quantity
A. True
B. False

Answer 1

Hint: Scalar quantities have only a magnitude and do not depend upon any direction, when it comes in comparing to vector quantities of the same type, we have to compare both the magnitude and the direction.

Complete step-by-step answer:
Power is defined as the energy (or work) per unit time.
Power = \[\dfrac{{work(energy)}}{{time}}\]
Since, time is not considered as a vector quantity, and neither energy or work because the work is not directional. So the power is said to be the ratio of two scalar quantities. So yes, the power is a scalar quantity because it has a unit magnitude but no direction.

So, the correct answer is “Option A”.

Additional Information:Power is said to be the amount of energy to be transferred or converted as per unit time. Power is a scalar quantity. Here the output power of the motor is the product of the torque that the motor generates and the angular velocity of its output shaft. Power plays a very important role in physics i.e., it measures the rate at which the work is done and similarly at which energy is transferred. The S.I. the unit of power is watt (W).
Energy and power are very closely related but both of them have different physical quantities, which means that energy has the ability to cause change whereas the power is the rate of energy which can be moved or used.

Note: Don’t get confused in power and average power because both have different natures. Therefore, AVERAGE POWER is said to be the ratio of total work done by the body to the total time taken by the body. The S.I unit of average power is kilowatt hour (KWH).