The fourier transform of a voltage signal x(t) is X(f). The unit of X(f) is __________ .-A-voltsB-volt2C-volt/secD-volt sec-D-volt sec

D volt sec F[x(t)] = X(f) X(f) = x(t).e jpft.dt From above expression, the unit of x(t) x e j2pft is volts and that of dt is seconds.