Electrical Energy Power

Power is the rate at which work is done, and it is given by the formula:

P%20%3D%20%5Cfrac%7BW%7D%7Bt%7D

where

P

is power,

W

is work done, and

t

is time. The work done to lift the object is given by:

W%20%3D%20mgh

where

m

is the mass of the object,

g

is the acceleration due to gravity, and

h

is the height. Given: - Mass

m%20%3D%2025%20%5C%2C%20%5Ctext%7Bkg%7D

- Height

h%20%3D%2010%20%5C%2C%20%5Ctext%7Bm%7D

- Acceleration due to gravity

g%20%3D%2010%20%5C%2C%20%5Ctext%7Bm%2Fs%7D%5E2

- Time

t%20%3D%205%20%5C%2C%20%5Ctext%7Bmin%7D%20%3D%20300%20%5C%2C%20%5Ctext%7Bseconds%7D

Now, calculate the work done:

W%20%3D%2025%20%5Ctimes%2010%20%5Ctimes%2010%20%3D%202500%20%5C%2C%20%5Ctext%7BJ%7D

Now, calculate the power:

P%20%3D%20%5Cfrac%7B2500%7D%7B300%7D%20%3D%208.33%20%5C%2C%20%5Ctext%7BJ%2FS%7D

Chapter Questions
1 MCQs