An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as I and V . If another resistor R is connected in parallel with voltmeter, then

Question

An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as I and V . If another resistor R is connected in parallel with voltmeter, then (A) I and V increase (B) I increases (C) I and V will remain same (D) I decreases

Tardigrade Admin · Accepted Answer

When the resistor R is connected in parallel with voltmeter,the effective resistance in the circuit decreases because ((1/R)=(1/R1)+(1/R2)). Therefore current, I=(V/R) increases.

Q. An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as $I$ and $V$ . If another resistor $R$ is connected in parallel with voltmeter, then

$I$ and $V$ increase

$I$ increases

$I$ and $V$ will remain same

$I$ decreases

$I$ remains constant

When the resistor $R$ is connected in parallel with voltmeter,the effective resistance in the circuit decreases because $(\frac{1}{R} = \frac{1}{R _{1}} + \frac{1}{R _{2}})$ .
Therefore current, $I = \frac{V}{R}$ increases.

Q. An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as I and V . If another resistor R is connected in parallel with voltmeter, then

I and V increase

I increases

I and V will remain same

I decreases

I remains constant

When the resistor R is connected in parallel with voltmeter,the effective resistance in the circuit decreases because (R1​=R1​1​+R2​1​). Therefore current, I=RV​ increases.