Question

resistors of 6 ohm,8ohm,12ohm are given in figure. Find the reading of ammeter and voltmeter also give reason for your answer​

Answer 1

Given :

Three resistors are connected as shown in the figure.

To Find :

Reading of ammeter and voltmeter.

Solution :

❖ In order to find reading of ammeter, we need to calculate equivalent resistance of the circuit first.

» Here all three resistances are connected in series hence their equivalent resistance will be

➙ R = R₁ + R₂ + R₃

➙ R = 6 + 8 + 12

➙ R = 26 Ω

Net current flow in the circuit :

As per ohm's law, current flow in the circuit is directly proportional to the applied potential difference$.$

Mathematically, V = I × R

• V denotes voltage
• I denotes current
• R denotes resistance

By substituting the given values;

➙ 6 = I × 26

➙ I = 6/26

➙ I = 0.23 A

∴ Reading of ammeter is 0.23A

❖ Reading of voltmeter :

➛ V' = I × R₃

➛ V' = 0.23 × 12

➛ V' = 2.76 volt

Answer 2

$\huge{\underline{\underline {\mathtt{\purple{Hlw}\pink{Mate}}}}}$

$\Large\bold\blue{Given:}$

Three resistors are connected as shown in the figure.

$\Large\bold\blue{To\:Find:}$

Reading of ammeter and voltmeter.

$\Large\bold\blue{Solution:}$

Here all 3 resistances are connected in series hence their equivalent resistance will be

R = R₁ + R₂ + R₃

R = 6 + 8 + 12

R = 26 Ω

Net current flow in the circuit :

As per ohm's law, V = I × R which means current flow in the circuit is directly proportional to the applied potential difference.

V = voltage

I = current

R = resistance

Substituting the given values

6 = I × 26

I = 6/26

I = 0.23 A

∴ Reading of ammeter is 0.23A

Reading of voltmeter

V' = I × R₃

V' = 0.23 × 12

$\Large\fbox\red{V' \:=\:2.76\:volt}$