A lamp in which 10 amp current can flow at 15 V, is connected with an alternating source of potential 220 V. The frequency of source is 50 Hz. The impedance of choke coil required to light the bulb is

0.07 H

0.14 H

0.28 H

1.07 H

Solution

0.07 H

The resistance of lamp

$R = \frac{V}{I} = \frac{15}{10} = 1.5 Ω The impedance of circuit Z = \frac{V}{I} = \frac{220}{10} = 22 ohm Again impedance z = \sqrt{R^{2} + ω^{2} L^{2}} \Rightarrow 22 = \sqrt{{(1.5)}^{2} + {(2 \times π \times 50)}^{2} L^{2}} \Rightarrow {(22)}^{2} = {(1.5)}^{2} + 4 π^{2} \times 50^{2} \times L^{2} \Rightarrow L = 0.07 Henry$

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Electric Charges And Fields

A lamp in which 10 amp current can flow at 15 V, is connected with an alternating source of potential 220 V. The frequency of source is 50 Hz. The impedance of choke coil required to light the bulb is

0.07 H

0.14 H

0.28 H

1.07 H

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For Daily Free Study Material Join wiredfaculty

Electric Charges And Fields

A lamp in which 10 amp current can flow at 15 V, is connected with an alternating source of potential 220 V. The frequency of source is 50 Hz. The impedance of choke coil required to light the bulb is 0.07 H 0.14 H 0.28 H 1.07 H

Some More Questions From Electric Charges and Fields Chapter

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

A lamp in which 10 amp current can flow at 15 V, is connected with an alternating source of potential 220 V. The frequency of source is 50 Hz. The impedance of choke coil required to light the bulb is

0.07 H

0.14 H

0.28 H

1.07 H