If I have a capacitor with a capacitance of 0.000005 farads is wired in a circuit with a total resistance of 5000 ohms, how long must the capacitor be wired to a source voltage to reach 50% of its maximum charge? With q = Q [ 1 - e ( - t / RC ) ].

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q = Q [ 1 - exp(- t/RC ) ]

This equation governs the charging of the capacitor with time. At any instant t, if we know the value of R and C we can calculate the "instantaneous value" of ...

Solution Summary

This shows how to find the time required to reach a given percentage of maximum charge for a capacitor.

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