The voltage v(t) in a telephone wire has the following characteristics: v(t) = 0 at t=0, v(t)= 20mV at t = 20ms, v(t) = 0 at t = 30ms, v(t) = -20mV at t = 40ms, v(t)=0 at t=50ms (a) Sketch the voltage waveform. (b) Derive a mathematical expression to describe the voltage function. (c) How much power is dissipated in the telephone wire if the current flowing through the wire is 2 mA? How much energy is absorbed in 50ms.
