Imagine a person lifting a 10 kg weight a distance of 2 meters in 5 seconds.
* Work done: Work is the force applied over a distance. In this case, the force is the weight's force due to gravity (10 kg * 9.8 m/s² = 98 N) and the distance is 2 meters. So, work done = 98 N * 2 m = 196 J.
* Time taken: The person takes 5 seconds to lift the weight.
* Power: Power is the rate at which work is done. It is calculated as work done divided by time taken. Therefore, power = 196 J / 5 s = 39.2 Watts.
This means that the person is doing work at a rate of 39.2 Watts, which is the power output of the person while lifting the weight.
Another example:
A car engine with a power output of 100 horsepower (which is equivalent to about 74.6 kilowatts) can accelerate the car from 0 to 60 mph in 5 seconds. This is a measure of the power the engine is able to deliver.
Key takeaways:
* Power is the rate at which energy is transferred or work is done.
* It is measured in Watts (W) or horsepower (hp).
* The higher the power, the faster the work is done or the more energy is transferred in a given time.
