Question

if a resistance of 20 ohm is connected across a potential difference of 40 volt find the number of electron flow through the wire if current flow for 2 minutes​

Answer 1

i=v/r

i=40/20

i=2A

t=2*60

t=120s

q=120*2

q=240c

q=ne

n=240/1.6*10^-19

n=15*10^-18