Question

What is power?

Answer 1

The quantity of energy moved or transformed per unit time is referred to as power in physics. The watt, which is equal to one joule per second in the International System of Units, is the unit of power. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Complete step-by-step solution:
Power is the time derivative of work; it is the pace at which work is completed with regard to time:
$P = \dfrac{{dW}}{{dT}}$
Because power is constantly proportional to the amount of effort done, if a person works at various rates at different times, his power will likewise vary. The idea of average-power enters the picture at this point.
We can define power as the pace at which work is completed, or the amount of work completed in a given amount of time. Watt (W), or joules per second (J/s), is the SI unit of power. Horsepower (hp), which is roughly equivalent to 745.7 watts, is sometimes used to describe the power of motor vehicles and other machinery.
The total energy utilised divided by the whole time spent is what we call average power. In layman's terms, average power is defined as the average amount of effort or energy converted per unit of time.
The combination of forces and movement in mechanical systems is known as power. Power is defined as the product of a force on an object and the velocity of the object, or the product of a torque on a shaft and the angular velocity of the shaft. The time derivative of work is another term for mechanical power.

Note: The product of the torque generated by a motor and the angular velocity of its output shaft is the motor's output power. The product of the traction force on the wheels and the vehicle's velocity is the power required to move a ground vehicle. The product of the engine thrust and the vehicle velocity is the motive power of a jet-propelled vehicle in classical mechanics, as measured from a stationary frame of reference. Watts - the electrical energy utilised per unit of time – are used to quantify the rate at which a light bulb transforms electrical energy into light and heat.