27. Define power.iys sit
Answers
Answer:
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Explanation:
In physics, power is the rate of doing work or of transferring heat, i.e. the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second.
The equation for power can be written as the rate of work:
{\displaystyle {\text{power}}={\frac {\text{work}}{\text{time}}}}{\displaystyle {\text{power}}={\frac {\text{work}}{\text{time}}}}
Power is a scalar quantity that requires both a change in the physical system and a specified time interval in which the change occurs. This is distinct from the concept of work, which is measured only in terms of a net change in the state of the physical system. The same amount of work is done when carrying a load up a flight of stairs, regardless of speed. But more power is needed when the work is done in a shorter amount of time.
The output power of a motor is the product of the torque that the motor generates and the angular velocity of its output shaft. The power involved in moving a ground vehicle is the product of the traction force on the wheels and the velocity of the vehicle. The power of a jet-propelled vehicle is the product of the engine thrust and the velocity of the vehicle. The rate at which a light bulb converts electrical energy into light and heat is measured in watts—the electrical energy used per unit time
Answer:
the rate of doing work or of transferring heat.
p= w/t