Question

A wire carries a current of 2.0A. What is charge that has flowed through is cross section in 1.0s? How many electrons does his correspond to?

Answer 1

Given:

1. Current, I = 2.0 A

2. Time, t = 1.0s

To Find:

1. Number of electrons flown

2. Quantity of Charge

Solution:

We know that,

☛ I = Q / t

⇒ 2 = Q / 1

⇒ Q = 2

So, 2.0 coulombs charge has flowed.

Now,

☛ Q = n • e

⇒ 2 = n • 1.6 × 10^-19

⇒ n = 2/1.6 × 10^-19

⇒ n = 12.5 × 10^18

So, 12.5 × 10^18 electrons have flown.

Answer 2

Given:

1. Current, I = 2.0 A

2. Time, t = 1.0s

To Find:

1. Number of electrons flown

2. Quantity of Charge

Solution:

We know that,

☛ I = Q / t

⇒ 2 = Q / 1

⇒ Q = 2

So, 2.0 coulombs charge has flowed.

Now,

☛ Q = n • e

⇒ 2 = n • 1.6 × 10^-19

⇒ n = 2/1.6 × 10^-19

⇒ n = 12.5 × 10^18

So, 12.5 × 10^18 electrons have flown.