The correct answer is: D. either (A) or (B)
A fuse wire is a safety device that is used to protect electrical circuits from damage caused by excessive current. It is a thin wire that is made of a material that melts at a relatively low temperature. When too much current flows through the fuse wire, it will melt and break the circuit, preventing further damage.
Fuse wires can be inserted in either the positive or negative circuit of a DC circuit. The most common way to insert a fuse wire is in the positive circuit, as this is the circuit that carries the most current. However, it is also possible to insert a fuse wire in the negative circuit, if necessary.
It is important to note that the fuse wire must be inserted in the correct polarity. If the fuse wire is inserted in the wrong polarity, it will not work properly and may not protect the circuit from damage.
The following are some of the reasons why a fuse wire may blow:
- A short circuit occurs. A short circuit is a situation where two wires that are carrying current come into contact with each other. This can cause a large amount of current to flow through the circuit, which can blow the fuse wire.
- A circuit overload occurs. A circuit overload occurs when too much current is drawn from the circuit. This can cause the fuse wire to overheat and blow.
- A faulty fuse wire is used. If a fuse wire is faulty, it may not blow even when there is a short circuit or circuit overload. This can cause damage to the circuit.
It is important to replace a blown fuse wire with a fuse wire of the correct amperage. The amperage of a fuse wire is the amount of current that it can safely carry. If a fuse wire with a higher amperage is used, it may not blow even when there is a short circuit or circuit overload. This can cause damage to the circuit.
It is also important to check the circuit for any problems that may have caused the fuse wire to blow. If a short circuit or circuit overload is found, it should be repaired before the fuse wire is replaced.