Charge and energy
Q = C × V and E = ½ × C × V². The RC time constant τ = R × C is the time to reach about 63.2% of a step.
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Charge, stored energy and time constant for a capacitor.
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Calculate Q = CV, E = ½CV² and τ = RC.
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Assumptions and limits.
- Ideal capacitor; leakage and equivalent series resistance ignored.
Frequently asked questions
What does the time constant mean?
It is the time to reach approximately 63.2% of the final voltage in a simple RC charging circuit.