Circuit breakers and short circuits

In summary, a short circuit is an unwanted pathway with low resistance that allows a large amount of electrical current to flow, potentially causing damage or fire. A circuit breaker is a device that cuts off power when the current is too high, typically due to a short circuit, to prevent further damage.
  • #1
GT1981
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Homework Statement


Hi,

This isn't so much an actual problem, just more of a general question. Can anyone give me a layman's explanation of what a short circuit is and how a circuit breaker deals with that? Or, can anyone refer me to any sources that can? I have taken high school physics, so anything along that level would be greatly appreciated!

THANKS SO MUCH!

_GT


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  • #2
short circuit is an unwanted pathway (usually much lower resistance than any other paths) where electrical current travels through to reach the "sink" (say ground, earth, -ve terminals). The reason that electrical current will flow through this path than through other paths because it has much lower resistance. As a result, a huge amount of current will go through this path --> dissipating huge amount of energy on the path--> making it to heat up and burnt...and fire etc.

the circuit breaker is a device that cuts of power when the current being drawn is too high, usually as a result of a short circuit (remember it has low resistance and so it "encourages" more current to flow). the breaker can be just a fuse: when the fuse gets too hot it breaks and stop the current flow BEFORE other part of the circuit starts burning. or it could be made up of a thermostat, using the fact that it will gets hot when there is a short circuit (from high current),... basically, the thermostat bends and if it is hot enough, it will bend far enough to trigger a cut of power.
 
  • #3


A short circuit occurs when there is a low resistance path between two points in an electrical circuit, causing a large amount of current to flow through that path. This can happen due to a damaged wire or component, or improper wiring. This can be dangerous as it can cause overheating and potentially start a fire.

A circuit breaker is a safety device that is designed to protect against short circuits. It works by detecting when there is an abnormally high amount of current flowing through the circuit, and then quickly breaking the circuit to stop the flow of electricity. This helps to prevent damage to the circuit and potential hazards such as fires. Circuit breakers are designed to trip or switch off when the current exceeds a certain level, and can be reset once the issue has been resolved.

In simpler terms, a circuit breaker acts as a safety switch that automatically shuts off the flow of electricity when it detects a problem, such as a short circuit. This helps to protect both the circuit and the devices connected to it, as well as ensuring the safety of the individuals using the circuit.
 

FAQ: Circuit breakers and short circuits

1. What is a circuit breaker?

A circuit breaker is an electrical switch that automatically interrupts the flow of electricity in a circuit in the event of an overcurrent or short circuit. It is designed to protect the electrical system and prevent damage to appliances and devices.

2. How does a circuit breaker work?

When the current in a circuit exceeds the rated amount, the circuit breaker detects the overcurrent and quickly opens the circuit, stopping the flow of electricity. This prevents the wires from overheating and causing a fire. Once the issue is resolved, the circuit breaker can be reset to restore the flow of electricity.

3. What is a short circuit?

A short circuit occurs when two or more wires in an electrical circuit come into contact with each other, causing a sudden increase in current flow. This can result in overheating, sparks, and potentially a fire.

4. How do you identify a short circuit?

One of the most common signs of a short circuit is a tripped circuit breaker or blown fuse. You may also notice sparks or smoke coming from an outlet or appliance, or a burning smell. Visual inspection of wires and outlets can also reveal signs of a short circuit, such as frayed or damaged wires.

5. How can you prevent short circuits?

To prevent short circuits, it is important to regularly inspect electrical wiring and outlets for any signs of damage. Avoid overloading circuits by plugging too many devices into one outlet. It is also important to use the correct size and type of circuit breaker for the electrical system. Working with a licensed electrician can help ensure proper installation and maintenance of electrical systems to prevent short circuits.

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