Question

what is the semi-circle?
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can anyone tell me ​

Answer 1

Joule's law, in electricity, mathematical description of the rate at which resistance in a circuit converts electric energy into heat energy. ... The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms.

Answer 2

Answer:

A half of a circle

or

Of its circumference.