A fuse converts electrical energy into thermal energy. When an excessive current passes through a fuse, it causes the fuse wire to heat up and melt, breaking the circuit and preventing damage to other components.
Because firstly, the fuse blew for a reason and it should not be replaced until the fault has been repaired, and secondly, if it would have blown again, the coin or nail would not work the same way a fuse would; the nail/coin/whatever would not burn out and the entire system is unprotected from a surge.
A fuse is a thin wire strip that is designed to melt easily when there is an excess of electric current flowing through wires. This melting action breaks the circuit, preventing damage to electrical components and reducing the risk of fire.
If too many charges flow (aka, short circuit) through the thin, metal conductor inside of the fuse, it melts, thereby making the circuit open and protecting the components from the effects of the short circuit. In your situation, the moment the short is created, the metal heats up very quickly. Since this metal has a very low melting point, any sudden, unexpected heat generated will melt the fuse, thus preventing the short from truly forming for an substantial amount of time
When a fuse blows, the energy transfer can be represented by the equation: Electrical energy → Thermal energy + Light energy + Sound energy
To determine if a fuse is blown, visually inspect the fuse for a break in the metal strip inside. If the metal strip is broken, the fuse is blown and needs to be replaced.
(A+) a strip of metal inside
The number on a fuse indicates its current rating, which corresponds to the maximum amount of electrical current the fuse can safely handle before it blows. This rating is directly related to the width and thickness of the metal strip inside the fuse; a wider and thicker strip can carry more current without overheating. If the current exceeds this limit, the metal strip heats up and melts, breaking the circuit to protect the electrical system from damage. Thus, the dimensions of the metal strip are crucial for ensuring the fuse operates as intended.
If you have access to the fuse box, take the fuse out and look at it. An intact fuse will have a visible, unbroken, metal strip running between the terminals. A blown fuse will have a broken metal strip on the inside and usually will be visibly discolored on the inside.
A fuse has a metal strip that melts and opens a circuit if the current becomes too great.
Metal strip inside fuse will be broken or burnt
The essential component of a fuse is a metal strip that or wire that melts when too much current flows through it.
It will burn out.
a fuse
A fuse
The fuse box by the driver side firewall contain a number of white or red one inch long plastic fuse. Each piece of plastic has a metal strip along its length. If the metal strip is broken then it's not good. If you can't see the break, then you can use a multimeter to check for continuity.
The fuse is made to blow at a set amperage to protect the wire from overheating. Using anything but the fuse may cause the circuit to work but could most certainly cause the wiring to overheat and burn if it is overloaded.