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Current Electricity

Current Electricity
Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.

Resistor
Reactor
Inductor
Capacitor

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Current Electricity
An electric filament bulb can be worked from

All of the listed here
AC supply only
Battery supply only
DC supply only

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Current Electricity
In a lamp load when more than one lamp are switched on the total resistance of the load

Remains same
Increases
Decreases
None of these

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Current Electricity
Varistors are

Carbon resistors
Insulators
Non-linear resistors
Resistor with zero temperature co-efficient

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Current Electricity
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

4 : 25
2 : 5
25 : 4
5 : 2

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Current Electricity
The resistance of conductor varies inversely as

Length
Resistivity
Temperature
Area of cross-section

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