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Current Electricity

Question

Wired Faculty App

An electric bulb is rated 220 volt − 100 watt. The power consumed by it when operated on 110 volt will be

50 watt

75 watt

40 watt

25 watt

Solution

D.

25 watt

fraction numerator straight V subscript 1 superscript 2 over denominator straight P subscript 1 end fraction space equals space fraction numerator straight V subscript 2 superscript 2 over denominator straight P subscript 2 end fraction space equals space Resistance rightwards double arrow space straight P subscript 2 space equals space 25 space straight W

Some More Questions From Current Electricity Chapter

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A

Voltage V

Current A

Voltage V

0.2

0.4

0.6

0.8

1.0

2.0

3.94

7.87

11.8

15.7

19.7

39.4

3.0

4.0

5.0

6.0

7.0

8.0

59.2

78.8

98.6

118.5

138.2

158.0

Answer the following questions:
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

Answer the following questions:
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.

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