How does a fuse work if there is a current that is too high?

Answer 1

The overflowed circuit would cause the fuse to burn and thus break the flow of electricity to the house.

This is a safety measure by which the flow of electricity is topped when the energy is higher than what the normal household appliances can handle.

Traditional fuses burn out and cant be re-used ( the wire inside really burns). Modern circuit breakers just flip the switch to off if more than sufficient current flows in. Once deemed safe, we can flip the breaker to On and resume the electricity flow.

Answer 2

That depends on what kind of fuse. A fast-blow will burn up right away, whereas a slow-blow may take some extra time (10 minutes or more) to burn.

The fuses burn just like a lightbulb, except the element is designed to last for just a short period of time.

With the fuse burnt (or "blown") the circuit opens and the current stops.

Note that incredibly large currents may bypass the blown fuse. It would require enough energy to pass the air gap, but it is possible.

Answer 3

You may have confused your terms. A fuse is designed to "blow," that is, melt and open the circuit when the current exceeds the rating of the fuse. The resistance of the load such as a light bulb is inverse to the current. So, at a constant voltage, if the resistance increases then the current decreases. This is where we use the equation known as Ohm's law. E=voltage(volts), I=current(amps), R=resistance(ohms). E=IR, I=E/R, R=E/I (oops, I wrote them wrong on the first try)
As an example, if the voltage is 80 volts and the resistance is 400 ohms then we can calculate that the current will be 80/400 which is 0.2 amps. Ohm's law works for both ac and dc because ac voltages are expressed in a way (RMS) that causes the power to be the same for both. That is another subject, but just in case you want to know, Power(in watts) P=I2R or I times I times R. I'll leave it to you to work out the other equations.

Answer 4

An electrical fuse is designed so that when the current through it exceeds its

rating, the wire inside the fuse melts. A gap appears in the wire, which 'opens'

the circuit, and current can no longer flow through it.

Answer 5

A fuse contains a thin metal strip through which the current flows, and if there is too much current, the thin metal strip will overheat and melt, which creates a gap that the current cannot pass. Note that most fuses have been replaced with circuit breakers, which have the advantage that they can be reset. A fuse, once blown, has to be replaced with a new fuse.

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On larger size service installations the requirement has to use a special type of fuse to interrupt the current flow. The category of these types of fuses usually fall into the classification of a HRC fuse. High Rupture Capacity fuse.

Stopping current flow once it is started is against the nature of flowing current. It wants to keep flowing even if it has to jump an air gap to do so. With lower current flows this less likely this to happen.

In a non HRC fuse of higher capacity, once the fuse link has opened, the current may continue to flow for a short duration of time. With the HRC fuses there is silica sand surrounding the fuse link. When the link burns open, a tremendous amount of heat is generated and the silica sand around the fuse wire melts, creating a glass barrier to suppress the electric arc. This action shuts down the current flow immediately.

Answer 6

The fusible link inside the fuse melts under the high temperature current rush. Each fuse link is rated to allow only a specific amount of current to pass. This is the number that is on the fuse, rated in allowable amperage. When this link melts it opens the circuit's continuity. Because the circuit is open, no current will flow.

Answer 7

A fuse is a piece of metal that is designed to melt if the current through it exceeds some limit.

Answer 8

Current