Question

The charge on an electron is 1.6×10^-19 C .Find the number of electrons that will flow per second to constitute a current of 2A.​

Answer 1

➦Current, I=2A

➦Time, t=1sec

➦aNumber of electron=n

The Charge on an electron, e=1.6×10^-19

We know that

Thus, I=Q/t

I=n×e/t [ Q = n×e]

2=n×1.6×10^-19/1

n= 2/1.6×10^-19

n=1.25×10^19

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Answer 2

Answer:

This is your verified answer!

Tips:

1. Electric charge is a basic property of electrons, protons and other subatomic particles.

2. A body can be positively or negatively charged.

3. The flow of electric charges through a conductor generates electricity.

4. Electric current is defined as the rate of flow of electric charge past a point or region. It is measured in Amperes.

Step 1 :

Write down the given information. Electric current can be given as

$I = \frac{Q}{t} - 1$

Total Charge is the product of number of electrons and the charge carried by them

$Q = ne$

Step 2 :

Substitute the value of Q in equation (1).

$I = \frac{ne}{t}$

$n = \frac{It}{e}$

Step 3 :

Calculate the number of electrons.

Substitute the values of I (current), t (time) and e (charge of an electron) as given in the question.

$I = 2A$

$t = 1s \\ e = 1.6 \times {10}^{ - 19} C$

$n = \frac{2 \times 1}{1.6 \times {10}^{ - 19} }$

$n = 1.25 \times {10}^{19}$

Final Answer:

The number of electrons will be n = 1.25 × 10¹⁹