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# Numerical Problems

Worked example Numerical Problems : 1. If 30 coulomb of electric charge flows through a wire in two minutes, calculate the current in the wire? 2. If 0.002A current flows through a circuit, then convert the current in terms of micro ampere?

Worked example 2.1

If  30 coulomb of electric charge flows through a wire in two minutes, calculate the current in the wire?

Solution

Given :

Charge (q)   = 30 coulomb

Time (t)      = 2 min x 60s

= 120 s

Current I = q/t = 30C/120s = 0.25 A

Worked Examples 2.2

If 0.002A current flows through a circuit, then convert the current in terms of micro ampere?

Solution:

Given that the current flows through the circuit is 0.002A

We know that

1A=106µA

0.002A = 0.002 × 106 µA

= 2 × 10-3 × 106 µA

= 2×103µA

0.002A = 2000 µA

Tags : Electricity | Term 2 Unit 2 | 7th Science , 7th Science : Term 2 Unit 2 : Electricity
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