Physics (parallel circuits)

Describe how current and potential difference act in parallel circuit

In a parallel circuit, the potential difference (voltage) across each component is the same, while the total current is the sum of the currents flowing through each parallel branch.

When you add a third branch with a resistor in a parallel circuit containing two branches, the total resistance of the circuit reduces. Explain why this happens.

Adding a third branch with a resistor provides an additional path for current to flow, which decreases the overall resistance due to the formula for total resistance in parallel circuits, where the total resistance is always less than the smallest individual resistance. M

Measuring resistance of a component

-The ammeter measures current
-The voltmeter measures the potential difference

-The variable resistor is used to change the potential difference through the circuit.

Mantra for current-voltage graphs

The steeper the gradient of a current voltage graoh the lower the resistance of the wire.