For the circuits A and B as shown in the figu | vedclass

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Question

(B) In circuit $A$,the voltmeter is connected directly across the resistor $R$. The ammeter measures the total current flowing through both the resist

Vedclass · Accepted Answer

Circuit $A$ is for accurate measurement of low resistance and $B$ is for high resistance.

Vedclass · Answer

(B) In circuit $A$,the voltmeter is connected directly across the resistor $R$. The ammeter measures the total current flowing through both the resistor $R$ and the voltmeter. Since the voltmeter has a very high resistance,the current flowing through it is very small. This circuit is preferred when the resistance $R$ is low,as the error introduced by the ammeter measuring the extra current is minimized.In circuit $B$,the ammeter is connected in series with the resistor $R$,and the voltmeter measures the potential difference across both the resistor $R$ and the ammeter. Since the ammeter has a very low resistance,the voltage drop across it is very small. This circuit is preferred when the resistance $R$ is high,as the error introduced by the voltmeter measuring the extra voltage drop across the ammeter is minimized.Therefore,circuit $A$ is used for low resistance and circuit $B$ is used for high resistance.

For the circuits $A$ and $B$ as shown in the figure,identify the correct option.

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