Question

The current in a wire is 4.0 amperes. What is the time required for `2.5 times 10^19` electrons to pass a certain point in the wire?

Answer 1

1 second

Explanation:

Formula for Current
`I=q/t`
`I`= Current
`q`= total charge
`t`=time taken to pass electron from a certain point

Number of Electrons `=2.5xx10^19`
Total charge `q=n e=2.5xx10^19xx1.6xx10^-19=2.5xx1.6=4 C`

Current `I=1 "ampere"`

`I=q/t`
`t=q/I=(4C)/(4 A)=1 "second"`