Voltage and current Sources Thevenin theorem a Transient in rc circuits If the electric field e is maintained in conductor by an external source say, a battery, then charges drift in the field and there is an electric current◼ Voltage and Current Sources ◼ Thevenin Theorem ◼ Transient in RC Circuits If the electric field E is maintained in conductor by an external source, say, a battery, then charges drift in the field and there is an electric current