Add the individual resistances: $R_{total} = R_1 + R_2 + R_3 + ...$

Calculate the reciprocal of the total resistance by summing the reciprocals of the individual resistances: $\frac{1}{R_{total}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_3} + ...$

1. Identify the junction. 2. Determine the currents entering the junction. 3. Determine the currents leaving the junction. 4. Apply the rule: ΣI_in = ΣI_out.

The total current entering a junction must equal the total current leaving that junction, based on conservation of charge.

The rate of charge transfer; the amount of charge flowing past a point per unit time.

A measure of the opposition to current flow in an electrical circuit.

A circuit in which components are arranged along a single path, so the current is the same through all components.

A circuit in which components are arranged in multiple paths, so the voltage is the same across all components.

The electric potential difference between two points in a circuit, measured in volts.

Decreases the current in the entire circuit.

Increases the total current drawn from the source and decreases the total resistance.

The voltage drop increases, according to Ohm's Law ($V = IR$).

The total power dissipated increases, since $P = \frac{V^2}{R}$ and resistance is constant.

The current in the remaining branches stays the same (assuming an ideal voltage source), but the total current supplied by the source decreases.

The resistance of the resistor typically increases, which can affect the current and voltage distribution in the circuit.