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Question

Which effect would you observe if one branch in a parallel resistor circuit is disconnected?

This question was previously asked in
RRB Technician 2026 Grade 3 Question Paper (7-Oct-2026) (Shift 3)
The correct answer is

Current through other branches remains unchanged

In a parallel circuit, every branch is connected directly across the same source voltage V.

Current in each branch is \(I = \frac{V}{R}\), which depends only on that branch's own resistance and the supply voltage.

Disconnecting one branch removes only that branch's current; the voltage across the remaining branches is still V, so their currents remain the same. Only the total current from the source falls.

The other currents do not become zero (each branch has its own path), and they neither decrease nor increase since V and R of those branches are unchanged.

Hence, the answer is Current through other branches remains unchanged.

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Similar Questions

  1. A circuit has three branches with resistors: 2 ohms, 4 ohms, and 8 ohms in parallel. Which statement correctly describes the current through the 2 ohm resistor compared to the 8 ohm resistor?

  2. Which of the following statements is correct, if three resistors of equal value are connected in parallel across a constant voltage source?

  3. Two resistors of 3 Ω and X Ω are connected in parallel such that the effective resistance is 2 Ω. What is the value of X (in Ω)?

  4. Two resistors with resistance of 2 Ω and 8 Ω are connected in parallel. What is the equivalent resistance (Req) of the combination?


Important Questions from Series and Parallel Connection of Resistance

  1. How much resistance must be connected in parallel with a 360 Ω resistor to obtain an equivalent resistance Req of 120 Ω?

  2. If n identical resistance, each of resistance R, are connected in parallel, the equivalent resistance is:

  3. Three resisters of 3 ohm, 10 ohm and 15 ohm are connected in parallel in a 30 V circuit. The current will that flow through the 3­-ohm resistor is:

  4. In which combination, the electrical appliances are connected at home?
  5. For the figure shown below, find the value of conductance 'G' (in S).

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