How long does it take to fully charge a 5 µF capacitor in series with a 5 MΩ resistor?

Question

Quizplus · Accepted Answer

The time constant ($\tau$) for an RC (resistor-capacitor) circuit is given by the formula $\tau = RC$, where R is the resistance in ohms ($\Omega$) and C is the capacitance in farads (F). For a 5 MΩ resistor and a 5 µF capacitor, $\tau = 5 \times 10^6 \Omega \times 5 \times 10^{-6} F = 25$ seconds. However, to fully charge a capacitor, it typically takes about 5 time constants, so the total time is $5 \times 25$ seconds = 125 seconds.

How Long Does It Take to Fully Charge a 5