Definition of Power
Power is defined as the amount of work done or the amount of energy transferred per unit time. It is measured in units of watts (W), where 1 watt is equivalent to 1 joule of energy being transferred per second.
Formula for Calculating Power
The formula for calculating power is:
Power (P) = Work (W) / Time (t)
Understanding Power
Power is a measure of how quickly work is done or energy is transferred. A high power means that work is being done at a fast rate, while a low power indicates a slower rate of work or energy transfer. For example, a powerful engine can do more work in a shorter amount of time compared to a less powerful engine.
Units of Power
The standard unit of power in the International System of Units (SI) is the watt (W). However, larger units such as kilowatts (kW) and megawatts (MW) are commonly used for measuring the power output of engines, power plants, and electrical devices.
Relationship Between Power and Energy
Power is closely related to energy, as power is the rate at which energy is transferred or used. The amount of energy transferred can be calculated by multiplying the power by the time for which the power is exerted.
Energy (E) = Power (P) × Time (t)
Real-life Applications of Power
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