A closed switch has a resistance of_____________?
A closed switch has a resistance of_____________?
A. zero
B. about 50 ohms
C. about 500 ohms
D. infinity
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Power dissipation in ideal inductor is
Power dissipation in ideal inductor is
A. Maximum
B. Minimum
C. Zero
D. A finite valueInternal resistance of ideal inductor is zero. As there is no resistance, there should not be any dissipation of power. Pure inductor has no resistive component, so it active power dissipation is zero.
The ratio of mass of proton to that of electron is nearly_____________?
The ratio of mass of proton to that of electron is nearly_____________?
A. 1840
B. 1840
C. 30
D. 4Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. 1/9 times
B. 3 times
C. 9 times
D. unchangedWhich 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.
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
A. decrease
B. increase
C. remain constant
D. none of the aboveThe resistivity of the conductor depends on
The resistivity of the conductor depends on
A. area of the conductor.
B. length of the conductor.
C. type of material.
D. none of these.The resistivity is a property of material, defined as the resistance between two opposite faces of a cube of a material of unit volume. That is why resistivity is only the unique property of material and it does not depend upon the dimension of any piece of material.