In the circuit shown here, the ammeter A reads 5A and the voltmeter V

1.	In the circuit shown here, the ammeter A reads 5A and the voltmeter V reads 20V. The correct value of resistance R is
Answer» Voltmeters generally have a very high resistance and ∴ a very small amount (>0A) of current passes through them. Thus,the amount of current flowing as I₁ ,(current through R) and I₂ (current through V) will be I=5A ⇒I₁ +I₂ =5 ∴I₁ =5−I₂ As I₂ >0 ⇒I₁ <5 Applying Ohm's law on the LHS of the above inequality, 20/R <5 since I₁ = 20/R ⇒ 20/5 <R ∴R>4Ω ∴ the correct value of resistance R is slightly greater than 4Ω

In the circuit shown here, the ammeter A reads 5A and the voltmeter V reads 20V. The correct value of resistance R is

Answer»

Voltmeters generally have a very high resistance and

∴ a very small amount (>0A) of current passes through them.

Thus,the amount of current flowing as I₁ ,(current through R) and I₂ (current through V) will be I=5A

⇒I₁ +I₂ =5

∴I₁ =5−I₂

As I₂ >0

⇒I₁ <5

Applying Ohm's law on the LHS of the above inequality,

20/R <5 since I₁ = 20/R

⇒ 20/5 <R

∴R>4Ω

∴ the correct value of resistance R is slightly greater than 4Ω

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In the circuit shown here, the ammeter A reads 5A and the voltmeter V reads 20V. The correct value of resistance R is

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