Question

A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes.Find the amount of electric current that flows through the circuit and find the elctrons

Answer 1

From the data given above you can find the amount of electric charge that passes through the circuit,
Using the equation,
Q = I * t (or) I = Q/t

(since current is defined as rate of flow of electric charge)
where Q = electric charge (Coulombs)
I = current (Ampere)
t = time taken (seconds)

Given; I = 0.5 A, t = 10 min = 600 s

Hence Q = I * t = 0.5 x 600
= 300 C

To find the number of electons for the charge Q , we use the formula---------
Q = ne
Where,
Q = charge,
n = no.of electrons and
e = charge on 1 electron and that is approx. 1.6 x 10^(-19) in negatively.

n = Q/e

n = 300C / 1.6 x 10^(-19)

n = 187.5 x 10^(19) electrons

= 1.87 x 10^(21) electrons