Question

If a bulb is 60w is connected across a source of 220v. Find the current draw by it?

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

ANSWER

A 60 Watt 220V bulb means that it will consume 60 Watts when the voltage across it is 220V.

In such a case the current flowing through it will be given byI=W/V=60/220 Amperes.

And the resistance of the filament will be W/I

2

=60×(

60

220

)

2

=806.67ohms

Now when you just apply 110 volts across it instead of 220V. In this case the current flowing through the bulb will be given by,

V/R=110/806.67=0.136 Ampere

And the power would beV×I=110×0.136=14.96≈15watts.

Answered B

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