Why is nichrome used as standard resistance?
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Why is nichrome used as standard resistance?
It has very low resistivity and a very high boiling point (~1400 °C) which makes nichrome a very good conductor of electricity and ideal material for making wires and standard resistance coil.
Why alloys are preferred for making standard resistance coils?
Alloys are used for making standard resistance coil because they have low temperature coefficient of resistance with less temperature sensitivity. The alloys also have high resistivity and hence high resistance, because for given length and cross-section area of conductor (L and A are constant).
Why manganin is used in meter bridge?
In a metre bridge, wires of nichrome, manganin and constantan are used because it has high resistance and low-temperature coefficient of resistance.
Which materials are used for making wires of standard resistance give two reasons?
The alloys ,example manganin , constantanor, and nichrome are the materials used for making a standard resistor.It is reason the alloys are used for this purpose for the reason that they posses high resistivity and low temperature coefficient of resist.
Which one of the following is the best material for making standard resistance wire?
Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, resistance wire is usually wound into coils.
Which of the following material is used for making coils of standard resistance?
Nichrome, a non – magnetic 80/20 alloy of nickel and chromium, it is the most common resistance wire per heating purpose because it has high resistivity and resistance to oxidation at high temperatures when used as a heating element resistance wire is usually wound into the coil.
Why manganin or German silver is used as meter bridge wire instead of copper?
The material of wire used in meter bridge is made of manganin or eureka due to there high specific resistance or resistivity. Thick copper strips are used in meter bridge because copper is a good conductor of electricity. This is done to minimize the percentage error in the value of the unknown resistance.
Why copper strips are used in meter bridge?
Why thick copper strips are used in meter bridge? The connection between the resistors in the metre bridge is done using thick copper wires. Copper has very low resistivity. By using thick copper wires the resistivity is reduced further.
Which material is best for standard resistance wire?
Which wire is used for making wire of standard resistance?
Constantan wire is used for making standard resistance because it has negligible temperature coefficient of resistance.
Which materials are used for making wire of standard resistance give two reasons?
What should be the properties of the standard resistance?
The properties of standard resistances should be: (i) Its value should not change with time. (ii) It should show negligible variation in resistance with temperature. (iii) It should have proper capacity for carrying current without overheating. (iv) It should have low inducatance.