For two resistors with resistances $R_1$ and $R_2$ connected in parallel, the total resistance $R_T$ is given by the formula shown below. $$\frac{1}{R_T} = \frac{1}{R_1} + \frac{1}{R_2}$$ Which statement is used to derive this formula?
- AThe currents through the two resistors are equal.
- BThe potential difference across each resistor is the same.
- CThe supply current is split between the two resistors in the same ratio as the ratio of their resistances.
- DThe total power dissipated is the sum of the powers dissipated in the two resistors separately.