The Circuit Elements of Capacitance and Inductance
The networks discussed previously have consisted of energy sources and energy dissipators but not energy storers. The circuit elements which store energy endow a network with non-instantaneous properties by virtue of the time necessary for them to increase or decrease their stored energy. A network consisting only of sources and resistances does not possess transient properties because the volt-ampere equations of the branches do not involve time. The volt-ampere equations of the two circuit elements which store energy contain time integrals and derivatives of voltage and current and therefore the response of a network containing these elements to a stimulus cannot be instantaneous.
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