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## Homework Statement

Find power of signal A u(t)

A is constant like 5, 6 some value.[/B]

## Homework Equations

Power is integration over -T/2 to +T/2 of [x(t)]

^{2}dt

The whole divide by T

## The Attempt at a Solution

Power is integration over -T/2 to +T/2 of [A u(t)]

^{2}dt[/B]

The whole divide by T

So 1/T integral A

^{2}dt...integral limits are -T/2 to +T/2

This comes as 1/T A

^{2}integral dt

integral dt is t. limits are -T/2 to +T/2

so integral dt = [T/2 - ( -T/2) ] which becomes T

so Poewr is 1/T * A

^{2}* T

which gives A

^{2}

But book answer is A

^{2}/2

Where did the divide by 2 come from?