Our physics expert picks his top-five equations, plus a scheme to supply US power needs with a bucket of baseballs. Thanks, ...

Work done = 10 × 2 = 20 J The triangle above will help you to rearrange the equation. Work done has the same units as energy - joules. This is because energy is the ability to do work.

is the rate at which energy is transferred or work is done. It has units of watts (W) or joules per second (J/s). The more energy that is transferred per second, or the more work that is done per ...