Question : Which of the following is the proper number of electrons in 1 A of current?
Option 1: 6.25 × 1021
Option 2: 6.25 × 1018
Option 3: 6.25 × 1019
Option 4: 6.25 × 1015
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Correct Answer: 6.25 × 10 18
Solution : The correct answer is 6.25 × 10 18 .
When a wire allows the flow of 1 Coulomb of charge in 1 second, the resulting current through the wire is 1 Ampere, expressed by the formula I = Q/t.
This relationship signifies that 1 Ampere is equivalent to the passage of 1 Coulomb of charge in 1 second.
Considering the charge on a single electron as 1.6 x 10^-19 Coulombs, using the unitary method, the current carried by one electron is 1.6 x 10^-19 Coulombs per second (Ampere). Therefore, 1 Ampere is equal to the flow of 1/(1.6 x 10^-19) electrons, or approximately 6.25 x 10 18 electrons.
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