1. The problem statement, all variables and given/known data Find power of signal A u(t) A is constant like 5, 6 some value. 2. Relevant equations Power is integration over -T/2 to +T/2 of [x(t)]2 dt The whole divide by T 3. The attempt at a solution Power is integration over -T/2 to +T/2 of [A u(t)]2dt The whole divide by T So 1/T integral A2 dt...integral limits are -T/2 to +T/2 This comes as 1/T A2 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 * A2 * T which gives A2 But book answer is A2 /2 Where did the divide by 2 come from?