Question

A student tells you that the current leaving the light bulb in a flashlight is less...

A student tells you that the current leaving the light bulb in a flashlight is less than the current entering the bulb, because current is used up in the bulb to make heat and light. Explain on theoretical and experimental grounds why you agree or disagree with the student’s analysis.

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Answer #1

No, I donot agree with him .

Let me explain

1. Theoretically.   

According to Kirchoff's voltage law

When current enters a bulb or any resistance will decrease the Voltage by amount of i × R

Where I is the current and R is the resistance.

Now understand it decreases the potential not the current current will be Same.

Yes some energy is used up that doesn't not affect the current.....

2.Experimental

supoose a bulb is connected to a battery or a voltage source . Ok

​​​​​​

Now see the current leaving the battery must enter it again for the continouty of the loop

If the current is lost in bulb this is not possible so.

No current is lost.....

Also if you want more explanation ask in comments....

Stay safe :)

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