In short circuit, the value of electric current in a time circuit:

Question

In short circuit, the value of electric current in a time circuit:

1. A. Very low
2. B. Do not change
3. C. Increases very high (Correct answer)
4. D. Continuously changing

Correct Answer

Option C — Increases very high

Detailed Solution & Explanation

The correct answer is Increases very high.

Key Points

• In a short circuit, the electric current in the circuit increases to a very high value.
• A short circuit occurs when the live wire and the neutral wire come into direct contact, usually because of damaged insulation or a loose connection.
• This creates a path of extremely low resistance that bypasses the appliance.
• By Ohm's Law, I = V/R, when the resistance R becomes very small while the supply voltage V stays constant, the current I rises enormously.
• The excessive current generates heat according to Joule's law of heating, H = I²Rt, which can melt wiring, damage appliances and start electrical fires.
• This is exactly why protective devices are essential: a fuse or a Miniature Circuit Breaker (MCB) interrupts the circuit when the current exceeds a safe limit.

Exam Tip

• distinguish a short circuit (contact between live and neutral) from overloading (too many appliances drawing current on one circuit) — both raise current, but their causes differ, and BPSC asks the cause.

प्रश्न (हिन्दी में)

लघु पाथन के समय परिपथ में विद्युत धारा का मान:

1. A. बहुत कम हो जाता है
2. B. परिवर्तित नहीं होता है
3. C. बहुत अधिक बढ़ जाता है
4. D. निरन्तर परिवर्तित होता है