A dc current of 200 mA is switched into a circuit at t=0 write the expression fo

Question

A dc current of 200 mA is switched into a circuit at t=0 write the expression for the circuit i(t) and sketch it?



A dc voltage of 12 V is switched on at t=5 s, write the expression for the circuit e(t) and sketch it?



A dc current of 80 mA is switched on at t=200 ms, write the expression for the current i(t) and sketch it?





A certain time is used as a reference for t= 0 in a problem . A certain dc voltage of 60 V is switched on 8 s prior to the reference time, write an expression for the voltage e(t) and sketch it?



sketch the voltage waveform given by : e(t) = 20u(3t-15)

Explanation / Answer

a) i(t)= 200 u(t) mA Where u(t) is the step input( zero for t0) b) V= 12 u(t-5) V shift the step input to the right by 5 units c) i= 80 u(t-200ms) mA shift the step input to the right by 200ms d) V= 60 u(t+8) V shift the step input to the left by 8 sec e) e(t)= 20 u(3(t-5)) shift the step input to the right by 5 units.. since step input is constant, the time scaling factor 3 doesnot change its shape

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