Contents
What effect does resistance have on voltage?
The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.
How does a fuse affect voltage?
The voltage rating of a fuse must be at least equal to or greater than the circuit voltage. It can be higher but never lower. If a fuse is used with a voltage rating lower than the circuit voltage, arc suppression will be impaired and, under some overcurrent conditions, the fuse may not clear the overcurrent safely.
Is the output voltage of a fuse always the same?
Theoretically the output voltage should stay the same, but will it change at all in a real world scenario? Yes it will, because any real world fuse has resistance. And this resistance will also change with temperature. Next question: how much resistance has a fuse?
How much resistance does a fuse really have?
Next question: how much resistance has a fuse? Well, it depends on its type and on its voltage, current and I 2 t ratings. The nominal “cold” resistance (i.e., at < 10% rated current) can range from < 10 milliOhms up to several Ohms. As an example, look at this Littelfuse catalog.
What is the resistance of a fractional amperage fuse?
RESISTANCE:The resistance of a fuse is usually an insignificant part of the total circuit resistance. Since the resistance of fractional amperage fuses can be several ohms, this fact should be considered when using them in low-voltage circuits. Actual values can be obtained by contacting Littelfuse.
What happens to a fuse when the current exceeds its rating?
Fuses are one-time protective devices. They conduct current up to a value that the fuse is rated for. When the current exceeds the rating, the fuse element will melt or “fuse” and the device will become an open circuit and interrupt the current.