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Current Electricity

Current Electricity
Temperature coefficient of resistance is expressed in terms of

mhos/ohm°C
ohms/°C
mhos/°C
ohms/ohm°C

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Current Electricity
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.

Varistors
Semiconductors
Thermistor
Variable resistors

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Current Electricity
Which of the following is the best material for making connecting wires?

Constant
Copper
Manganin
Nichrome

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Current Electricity
Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open

Rest of the two bulbs will not light
There will be heavy current in the main line
All three bulbs will light
The other two bulbs will light

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Current Electricity
Electric current is a

Vector quantity
Sometimes scalar and sometimes vector
Number only
Scalar quantity

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Current Electricity
The resistance of a few meters of wire conductor in closed electrical circuit is

Very high
High
Practically zero
Low

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