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Current Electricity

Current Electricity
Temperature coefficient of resistance is expressed in terms of

mhos/°C
ohms/ohm°C
ohms/°C
mhos/ohm°C

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Current Electricity
The resistance of two wires is 25 Ω when connected in series and 6 Ω when joined in parallel. The resistance of each wire is

10 Ω, 20 Ω
20 Ω, 30 Ω
5 Ω, 10 Ω
10 Ω, 15 Ω

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Current Electricity
A copper wire is stretched so that its length is increased by 0.1 % . The change in its resistance is

0.4%
0.2%
None of the listed here
0.3%

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Current Electricity
Electrical current is due to the flow of

Positive charges only
Neutral particles only
Negative charges only
Both positive and negative charges

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Current Electricity
The maximum current rating for a 10 kΩ, 0.5 W resistor is

0.707 mA
14.14 mA
28.28 mA
7.07 mA

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Current Electricity
The resistance of a conductor varies inversely as

Length
Resistivity
Temperature
Are of cross-section

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