alleryStart learning →A short circuit is which of these?
AA low-resistance path across a supply
BA high-resistance path across a supply
CA break in the wire feeding a supply
DA path with no current flowing in it
Answer & Solution
Correct answer: A. A low-resistance path across a supply
1. A short circuit is an unintended low-resistance path between the terminals of a supply.
2. Worn insulation letting two conductors touch is the usual way one forms.
3. Because P = V squared / r and r is tiny, the power dissipated in the short is enormous.
4. A break in the wire is an open circuit, which is the opposite fault and passes no current.
_Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Thermal Hazards_
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