Basic Qualification · B-005 Basic electronics and theory · B-005-005-001
In a parallel circuit with a voltage source and several branch resistors, how is the total current related to the current in the branch resistors?
- A It decreases as more parallel resistors are added to the circuit
- B It is the sum of each resistor's voltage drop multiplied by the total number of resistors
- C It equals the sum of the branch current through each resistor
- D It equals the average of the branch current through each resistor
Correct answer: C — It equals the sum of the branch current through each resistor. From the official ISED question bank, verified word for word.
Why
In a parallel circuit, the total current flowing from the source splits up to feed each branch separately, so the main current must equal the sum of the currents flowing through every individual resistor. The full explanation — and one for every question — is in Pro.
Practise this section
The theory: Ohm's law, power, series and parallel circuits, AC and DC, frequency and wavelength, decibels, and the metric prefixes the exam leans on.