Question

How many electrons pass through a wire in one minute if the current passing through the wire is 200mA

Answer 1

I= 220 mA =0.22 A

I = Q/T

0.22 = Q/60

Q= 0.22 x 60 = 13.2 C

Q= ne

Where n= number of electrons

E= charge on electrons = 1.6 x 10-19

13.2 C = n x 1.6 x 10-19

n = 13.2/1.6 x 10-19

n = 8.25 x 1019

Answer 2

Given,

Current= $200mA$

The formula for current,

$current=\frac{charge}{time}$

$I=\frac{Q}{T}$

$Q= ne$

where the value of e is,

$e=1.6* 10^{-19}$

putting value in the formula of current,

$200*10^{-3} = \frac{n* (1.6*10^{-19)} }{60}$

$n= \frac{200* 10^{-3}* 60 }{1.6 *10^{-19} }$

simplifying and solving

$n= 75* 10^{18}$

#SPJ2