In the circuit of Fig., the current i_D through the ideal diode (zero cut in voltage and zero forward resistance) equals

In the circuit of Fig., energy absorbed by the 4 Ω registor in the time interval (0,$$\infty$$) is

The current "i₄" in the circuit of Fig. is equal to

The function f(t) has the Fourier Transform g($$\omega $$). The Fourier Transform of $$$g(t) = \left( {\int\limits_{ - \infty }^\infty {g(t){e^{ - j\omega t}}} } \right)\,is$$$