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Ideally, an electrical fuse should not have a high resistance.
It will generally have some, because the way most cartridge fuses work is by heating a thin filament to the melting point when a certain current flows through it. The heating is resistive heating, which is given by the equation P = I2R, or power = the square of the current times resistance.
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The above is 100% correct, I just want to add: A fuse does not reduce the power in any way, It simply does not allow too much power to be taken.
Example: You can use A 100amp fuse on A 10amp motor, The power supply will be 10amps because that's all the motor requires, but if there is a short or the motor is over worked the fuse will allow more chance of damage because its way too big for the job.
Another: If A 10amp fuse is used to protect A 100amp motor the motor will blow the fuse everytime its terned on, because the fuse will not allow the motor the necessary power to opperate.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoResistivity of conductors increases with temperature, with semiconductors it is opposite, I believe always - but don't take that as truth! Look up the temp coefficient for whatever material you're dealing with - if it is positive, the resistance increases with temperature; if it is negative it decreases.
Wiki User
∙ 12y agowires are made of metals,and metal possess positive temperature coefficient of resistance.So;when we increase the temperature of wire,consequently;the temp. increases.
AnswerThe resistance of a material is directly-proportional to its resistivity. Resistivity is affected by temperature. For pure-metal conductors, an increase in temperature causes an increase in resistitivity and, therefore, an increase in resistance.
Wiki User
∙ 9y agoIt's not compulsory that a high temperature wire will have more resistance.
Accordingly, the heat generated in the wire(H) is nothing but the product of resistance in the wire(R), square of current passing through the wire(i), the particular instant we calculate(time=t), .i.e, H=(i2)xRxt
This formula says that there are two cases.
CASE-I:
As heat is proportional to resistance in the wire, more heat will be generated due to the presence of high resistance.
This case says that the high temperature wire can have more resistance.
CASE-II:
As heat is proportional to square of current, more heat will be dissipated when more current passed through the wire.
This case says that the high temperature wire has got such a high temperature because of the more current passing through it.
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What happens to resistance of the wire if the wire is short?
Short wire has less resistance Long wire has more resistance Thick wire has less resistance Thin wire has more resistance
Can copper and alluminium wire of same length and diameter have same resistance?
For a single temperature, yes. The copper wire will have a much smaller cross-section than the iron wire. For multiple temperatures, no. Copper and iron have different temperature coefficients for resistivity.
Does a longer wire equal resistance?
Wire is not equal to resistance. If you have two pieces of wire with the same thickness, composition, and temperature, the longer piece has higher electrical resistance.
Does thickness of wire affect resistance?
yes.it affect.because thick wire cannot hold high resistance of current
How does wire thickness affects resistance?
Increasing wire thickness decreases its resistance, while increasing its length increases its resistance. Provided the voltage between the ends of the wire is constant, the current through it is inversely proportional to its resistance.
enameled aluminum?
Enameled aluminum wire has excellent high temperature resistance
What would reduce resistance in a copper wire?
Reduce the resistance:-- Use a shorter piece of wire.-- Use thicker wire.-- Cool the wire.Increase the resistance:-- Use a longer piece of wire.-- Use thinner wire.-- File a nick in the piece of wire you have.-- Stretch the wire.-- Heat the wire.
How does temperature affect resistance of a wire?
If you are asking if a hot wire has a greater resistance than a cold wire then the answer I would say is yes. Cold wires have always had less resistance than hot wires
What happens to resistance of the wire if the wire is short?
Short wire has less resistance Long wire has more resistance Thick wire has less resistance Thin wire has more resistance
Explain how the resistance of a wire varies with its length?
The resistance of a wire is a measure of how difficult it is for electricity to flow through the wire. The resistance of a wire is inversely proportional to its cross-sectional area and directly proportional to its length. This means that, all else being equal, the resistance of a wire increases as its length increases. There are several factors that can affect the resistance of a wire, including the type of material the wire is made of, the wire's cross-sectional area, and the wire's temperature. The resistivity of the material the wire is made of is a measure of how easily electricity can flow through the material, and different materials have different resistivities. For example, copper has a lower resistivity than aluminum, so a copper wire will have less resistance than an aluminum wire of the same size and length. In general, the resistance of a wire increases as its length increases because the electrons flowing through the wire encounter more and more obstacles as they travel through the wire. The longer the wire, the more obstacles the electrons must overcome, which increases the resistance of the wire. It is also important to note that the resistance of a wire is not a constant value, and it can change depending on the temperature of the wire. As the temperature of a wire increases, the resistance of the wire also increases. This is because the higher temperature causes the atoms in the wire to vibrate more, which makes it more difficult for the electrons to flow through the wire.
Which wire would have the lowest resistance a long thin iron wire at a high temperature or a short thick copper wire at a low temperature?
Copper will.
The magnitude of the resistance of a wire depends on?
Temperature, Length of wire, Area of the cross-section of wire and nature of the material.
Can copper and alluminium wire of same length and diameter have same resistance?
For a single temperature, yes. The copper wire will have a much smaller cross-section than the iron wire. For multiple temperatures, no. Copper and iron have different temperature coefficients for resistivity.
If voltage is high will the resistance be high?
The electric resistance is related to the diameter and extension of the wire submitted to a determined voltage which will determine the electric current flowing into the wire.AnswerVoltage has no effect on resistance. Resistance is determined by the length, cross-sectional area, and resistivity of a material (resistivity is affected by temperature, so temperature indirectly affect resistance).
Does a longer wire equal resistance?
Wire is not equal to resistance. If you have two pieces of wire with the same thickness, composition, and temperature, the longer piece has higher electrical resistance.
Which material has a greater resistance aluminum or copper wire?
Aluminium wire has high resistance than Copper.
A thicker resistance wire produces more heat?
I'm not sure what you mean by "thicker resistance" wire? The thicker or more diameter of a wire the less resistance it has. A larger diameter wire would produce less heat. More resistance would produce more heat.
