In electricity overloading cannot be caused by:

Question

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The correct answer is Option D: the live wire and the neutral wire coming into contact through a heavy resistance. Overloading occurs when the total current drawn from a circuit exceeds its rated capacity, leading to excessive heating. A short circuit (Option C) or a voltage hike (Option B) significantly increases current flow, whereas a high resistance (Option D) restricts current flow, preventing an overload condition.

Step-by-Step Solution & Concepts:
Overloading occurs when the total current drawn from a circuit exceeds its rated capacity, leading to excessive heating. A short circuit (Option C) or a voltage hike (Option B) significantly increases current flow, whereas a high resistance (Option D) restricts current flow, preventing an overload condition.

Working Principle: According to Ohm's Law $I = \frac{V}{R}$, current is inversely proportional to resistance. If the live and neutral wires make contact through a heavy (high) resistance, the resulting current $I$ remains low. In contrast, a direct short circuit results in near-zero resistance, leading to a massive surge in current ($I 	o \infty$), causing an overload.

Key Formulas: $I = \frac{V}{R}$ — Ohm's Law relating current, voltage, and resistance; $H = I^2Rt$ — Joule's Law of heating demonstrating why high current causes overloading

Key Points: Overloading is defined by a current exceeding the circuit's rated limit; Short circuit is a zero-resistance path between live and neutral wires; High resistance limits current, acting as a load rather than a fault; Voltage hikes increase power dissipation ($P = \frac{V^2}{R}$) leading to thermal overload

Additional Info: Option A: Connecting too many appliances increases total power demand, causing an overload.. Option B: An increase in $V$ causes an increase in $I$ for a fixed load, potentially exceeding the fuse rating.. Option C: This creates a low-impedance path causing a high-current short-circuit.. Option D: A high resistance ensures the current $I$ stays within a safe, manageable limit.

Answer: D is correct — the live wire and the neutral wire coming into contact through a heavy resistance restricts the current flow, preventing an overload.

Exam Tip: Remember that in electrical faults, low resistance equals high current (danger), whereas high resistance acts as a load-limiting factor.

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Option A: connecting too many appliances to a single socket

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Option B: accidental hike in the supply voltage

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Option C: the live wire coming in direct contact with the neutral wire

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