7.1 The Source-Free RC Circuit (2)
			• The natural response of a circuit refers to the behavior (in terms of voltages and currents) of the circuit itself, with no external sources of excitation.
		• The time constant  of a circuit is the time required for the response to decay by a factor of 1/e or 36.8% of its initial value. •  v decays faster for small t and slower for large t.