A high resistance voltmeter is connected to a dry

Question

A high resistance voltmeter is connected to a dry cell battery. The voltmeter reads 12v when the circuit is open and when a 24 ohm resistance is connected across the battery terminals the voltmeter reads 7.2 volt. Find internal resistance.

deepak · Accepted Answer

since the voltmeter reads 12v in a open circuit the EMF(E) of the cell is 12v but when a resistance(R) =24 ohm is connected then the terminal voltage(Tv) of the cell is measured to be 7.2v let the internal resistance be r, then by formula, r=R(E/Tv)&minus;R &hellip;.&hellip;.&hellip;.&hellip;.if you dont know this formula then check the expression for internal resistance of a cell expression in google substituting the values , r=16 ohm P.S. are you really 10th cause this is an 12th standard problem

Electric Current> A high resistance voltmeter is connected ...

A high resistance voltmeter is connected to a dry cell battery. The voltmeter reads 12v when the circuit is open and when a 24 ohm resistance is connected across the battery terminals the voltmeter reads 7.2 volt. Find internal resistance.

Harshini , 8 Years ago

deepak

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Electric Current> A high resistance voltmeter is connected ...

A high resistance voltmeter is connected to a dry cell battery. The voltmeter reads 12v when the circuit is open and when a 24 ohm resistance is connected across the battery terminals the voltmeter reads 7.2 volt. Find internal resistance.

Harshini , 8 Years ago

deepak

Provide a better Answer & Earn Cool Goodies

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Ask a Doubt

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