Question

a current of 1.30 a flows in a wire. how many electrons are flowing past any point in the wire per second
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Answer 1

Given:

Current of 1.30 Ampere is present in a wire.

To find:

Number of electrons passing through any point in 1 second ?

Calculation:

• 1 Ampere current means 1 Coulomb of charge pàssing through a cross-section of the conductor in 1 seconds.

So, 1.3 Ampere means 1.3 Coulomb charge pàssing in one second.

Number of electrons will be :

$no. \: of \: electrons = \dfrac{charge}{e}$

$\implies no. \: of \: electrons = \dfrac{1.3}{1.6 \times {10}^{ - 19} }$

$\implies no. \: of \: electrons = 0.8125 \times {10}^{ 19}$

$\implies no. \: of \: electrons = 8.125 \times {10}^{18}$

So, 8.125 × 10¹⁹ electrons pàssed through the wire per second.