Question

What will be the voltmeted of
resistance 250 ohm when it is connected across a cell of emf 2 V and inteonal resistance 12 ohm​

Answer 1

Answer:

Given: 

R = 100 Ω, 

r = 20 Ω, 

E = 2 V 

To find: Reading of voltmeter (V) 

Formula: V = E - Ir 

Calculation: Current through the circuit is given by 

I=R+rE=100+202=1202

I=601A

From formula, 

V=2−(601×20)=2−0.3333 

∴ V = 1.667 V 

The reading on the voltmeter is 1.667 V 

Answer 2

$\\⠀⠀\bigstar \:⠀⠀⠀\underbrace\bold{\large\underline{Given: - }}$

• R = 250Ω
• r = 12Ω
• E.M.F = 2 V

$\\⠀⠀\bigstar \:⠀⠀⠀\underbrace\bold{\large\underline{To⠀Find : - }}$

Reading of Voltmeter (V)

$\\⠀⠀\bigstar \:⠀⠀⠀\underbrace\bold{\large\underline{Formulae- E= Ir}}$

$\\⠀⠀\bigstar \:⠀⠀⠀\underbrace\bold{\large\underline{Calculating: }}$

∴ I = $\large\frac{E}{R+r}$

⟹ I = $\large\frac{2}{250+12}$

⟹ I = $\large\frac{2}{262}$

⟹ I = $\large\frac{1}{121}A$

$\huge{\pink{\boxed{\pink{\underline{\red{\mathscr{From}}}}}}}$$\huge{\pink{\boxed{\pink{\underline{\red{\mathscr{Formula}}}}}}}$

V = 2 - ($\large\frac{1}{121} × 12$)

⠀= 2- 0.174

⠀=1.826 V

$\large{ \pink{\mathfrak{ \underline{\overline{\mid \:\: V = 1.826 V \:\: \mid}}}}}$