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Nailing Challenging Secondary School Physics

By: Rajiv Misra
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In the diagram, V1 = 8 V, R1 = 2Ω and R2 = 4Ω. What is the value of I2, I3 and I1?

Topic: Electricity

Key Formula: V = IR

                          I1 = I2 + I3

Answer:

V2 = I2R1

8 = 2(I2)

I2 = 4A

 

V3 = I3R2

8 = 4(I3)

I3 = 2A

 

I1 = I2 + I3

   = 4 + 2

   = 6 A

 

Tip: In a parallel circuit, the voltage of the battery, EMF, is equal to the potential difference of the individual resistors. This produces the equation:  I1 = I2+I3 .

 

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Posted on 18/04/2017

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