Page 9 - CHAPTER-1 (Electricity)

CHAPTER 1

ELECTRICITY

Example 1:

A current of 150 mA allowed to flow through a circuit for 2min.

Compute the amount of charge that will flow through the circuit.

Solution:

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Given, Current I=150mA=150×10 A

Time, t=2min=2×60s=120s

Amount of charge, q=?

We know that, q=I×t

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⟹q=It=150×10 ×120=18C

So, 18C of charge flows around the circuit.

Example 2:

A total of 6 × 10 electrons are flowing through a current-carrying
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conductor in 20s when connected through an external power supply.

Find the value of current in the conductor.

Solution:

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Given, total number of electrons, n=6×10 electrons

Time, t=20s, Current, I= ?

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q ne 6×10 ×1.6×10 -19
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I= = = =4.8×10 A
t t 20

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Thus, the current passing through the conductor is 4.8×10 A.

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