For which of the following ‘ampere second’ could be the unit ?
For which of the following ‘ampere second’ could be the unit ?
A. Reluctance
B. Charge
C. Power
D. Energy
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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. infinityWith three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
A. 10 W
B. 20 W
C. 40 W
D. 60 WVoltage dependent resistors are used_____________?
Voltage dependent resistors are used_____________?
A. for inductive circuits
B. to supress surges
C. as heating elements
D. as current stabilizersInternal resistance of ideal voltage source is ?
Internal resistance of ideal voltage source is ?
A. zero
B. infinite
C. finite
D. 100 ohmsInternal resistance of ideal voltage source is
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
A. length of heating element should be decreased
B. length of heating element should be increased
C. length of heating element has no effect on heating if water
D. none of the aboveA field of force can exist only between_____________?
A field of force can exist only between_____________?
A. two molecules
B. two ions
C. two atoms
D. two metal particles