Question

A cell of emf 1.8V and Internal resistance 2 ohm is connected to an ammeter in series and a resistor of 4.5 ohm​

Answer 1

$\Large\underline{\underline{\sf Given:}}$

• Emf (e) = 1.8V

• Resistance (R') = 2Ω

• Internal Resistance (r) = 4.5Ω

$\Large\underline{\underline{\sf To\:Find:}}$

• Reading of Ammeter (I) = ?

$\Large\underline{\underline{\sf Formula\:Used:}}$

$\large{\boxed{\sf I=\dfrac{Emf(e)}{Total\: Resistance (R)}}}$

$\Large\underline{\underline{\sf Solution:}}$

Total Resistance (R) = R' + r

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⠀= 2 + 4.5

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀= 6.5 Ω

On Putting Value :

$\implies{\sf I=\dfrac{1.8}{6.5}}$

$\implies{\sf I=0.27\:A }$

$\Large\underline{\underline{\sf Answer:}}$

⛬ Reading of Ammeter is 0.27A