With these assumptions, the currents everywhere in the circuit in Fig. 1.2-5 become
the same function of time. Then there is essentially no difference between an electrical sys-
tem with a steady-source and an electrical system with time-varying source. The conductor
in Fig. 1.2-5 can be modelled by a two-terminal resistance element satisfying Ohm’s law on
an instant to instant basis. If v(t) is the electrostatic potential difference across the resistance
and i(t) is the current entering the higher potential terminal, then v(t) i(t)R.
1.3 TWO-TERMINAL CAPACITANCE
Consider the electrical system shown in Fig. 1.3-1. A source of time-varying e.m.f. ...
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