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Show that time constant (tau = RC) of R ...

Show that time constant `(tau = RC)` of `R - C` circuit has the dimensions of time.

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Time constant of RC circuit indicates how fast or how slow will be the charging and discharging of a capacitor through a resistor. A small value of `t = RC`, represents faster charging and discharging, whereas large value of `t = RC`, indicates slower charging and discharging of the capacitor.
For a given circuit, time constant is fixed. We can optimise the value of time constant by choosing suitable value of R and C.
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