A thermistor has_____________?
A thermistor has_____________?
A. positive temperature coefficient
B. negative temperature coefficient
C. zero temperature coefficient
D. variable temperature coefficient
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Which quantity consists of a unit 1KWh ?
Which quantity consists of a unit 1KWh ?
A. Energy
B. Time
C. Power
D. Charge1 kWh is the amount of energy used by a 1 kW (1000 watt) resistance for 1 hour. Energy = Power × Time.
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
A. 0.4 ohm
B. 0.6 ohm
C. 0.8 ohm
D. 1.0 ohmWith rise in temperature the resistance of pure metals______________?
With rise in temperature the resistance of pure metals______________?
A. increases
B. decreases
C. first increases and then decreases
D. remains constantThe rating of a fuse wire is always expressed in________________?
The rating of a fuse wire is always expressed in________________?
A. ampere-hours
B. ampere-volts
C. kWh
D. amperesElectric current passing through the circuit produces_____________?
Electric current passing through the circuit produces_____________?A. magnetic effect
B. luminous effect
C. thermal effect
D. chemical effect
E. all above effectsWhen electric current passes through a metallic conductor, its temperature rises. This is due to__________?
When electric current passes through a metallic conductor, its temperature rises. This is due to__________?
A. collisions between conduction electrons and atoms
B. the release of conduction electrons from parent atoms
C. mutual collisions between metal atoms
D. mutual collisions between conducting electrons