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Current Electricity
The hot wire of electric bulb's filament is higher than its cold resistance because the temperature co-efficient of filament is
Negative
Positive
Zero
None of the listed here
Negative
Positive
Zero
None of the listed here
Answer
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Related Question
Current Electricity
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will
Remain constant
Increase
Decrease
None of these
Remain constant
Increase
Decrease
None of these
Answer
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Current Electricity
Constantan wire is used for making starndard resistance because it has
Negligibly small temperature co-efficient of resistance
High specific resistance
Low specific resistance
High melting point
Negligibly small temperature co-efficient of resistance
High specific resistance
Low specific resistance
High melting point
Answer
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Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around
1.8 x 10-8 ω-m
1.6 x 10-8 ω-m
1.2 x 10-8 ω-m
1.4 x 10-8 ω-m
1.8 x 10-8 ω-m
1.6 x 10-8 ω-m
1.2 x 10-8 ω-m
1.4 x 10-8 ω-m
Answer
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Current Electricity
An open resistor, when checked with an ohmmeter reads
High but within tolerance
Infinite
Low but not zero
Zero
High but within tolerance
Infinite
Low but not zero
Zero
Answer
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Current Electricity
Ampere-hour is the unit of
Power
Energy
Strength of current
Quantity of electricity
Power
Energy
Strength of current
Quantity of electricity
Answer
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