Which statement best describes a dead short in an electrical circuit?

Which statement best describes a dead short in an electrical circuit?

• A. It occurs when resistance is very high.
• B. It is a direct connection between power and ground with near-zero resistance, causing a high current.
• C. It happens only when the power is off.
• D. It is a normal operating condition.

Answer: (B)

A dead short happens when power is connected directly to the return path with almost no resistance, bypassing the intended load. Because the resistance is nearly zero, the current becomes very large, according to I = V/R, which can cause fuses to blow, breakers to trip, and wires or components to overheat in a blink. That explosive current is what defines a dead short and why it’s so dangerous in electrical systems. The other descriptions don’t fit: a very high resistance would limit current rather than create a surge; a short can occur with power on and is hazardous precisely because of the high current, while normal operation uses a proper load and so does not produce a direct, near-zero-resistance path to ground.

A dead short happens when power is connected directly to the return path with almost no resistance, bypassing the intended load. Because the resistance is nearly zero, the current becomes very large, according to I = V/R, which can cause fuses to blow, breakers to trip, and wires or components to overheat in a blink. That explosive current is what defines a dead short and why it’s so dangerous in electrical systems. The other descriptions don’t fit: a very high resistance would limit current rather than create a surge; a short can occur with power on and is hazardous precisely because of the high current, while normal operation uses a proper load and so does not produce a direct, near-zero-resistance path to ground.