If a current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons would flow through the wire?

Q3.10: If a current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons would flow through the wire?

Solution:

Current, I = 0.5 A

Time, t = 2 hours

 Convert in sec we get

Time, t = 2 × 60 × 60 s

 = 7200 s

Use formula

Charge           Q = It

Plug the values we get

                            = 0.5 A × 7200 s

    = 3600 Coulombs

Number of electrons = total charge / charge on 1 electrons

                                     = 3600/(1.6 ×10 ¹⁹)

                                     =2.25 × 10²² electrons