Question

1 coulomb is equal to How many electrons?

Answer 1

1 couloumb is equal to

$C = 6.25*10^{18}$

Answer 2

Concept:

Electricity - Charge on electron and current.

Find:

Number of electrons in 1 Coulomb of charge.

Answer:

1 coulomb = 1.639 × 10¹⁸ electrons.

Solution:

Coulomb is the unit of charge and it is denoted as "C". As we know that electric current is defined as the rate of flow of charge, we have

I = Q/t

where I = Current

Q = Charge

t = Time

From the above equation,

Q = It

Charge = Current × Time

1C = 1A × 1s

1C = 1A-s

1 coulomb = 1 ampere second

Now, charge on an electron is given by,

e = 6.1 × 10⁻¹⁹ C

1 C = 1/6.1 × 10⁻¹⁹ electrons

1 C = 0.1639 × 10¹⁹ electrons

1 C = 1.639 × 10¹⁸ electrons

Hence, 1 coulomb = 1.639 × 10¹⁸ electrons.

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