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(A) with the Help of a Circuit Diagram, Obtain the Relation for the Equivalent Resistance of Two Resistances Connected in Parallel. (B) in the Circuit Diagram Shown Below, Find: (I) Total - Science


(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:

(i) Total resistance.
(ii) Current shown by the ammeter 

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Let the individual resistance of the two resistors be R1 and R2 and their combined resistance be R. Let the total current flowing in the circuit be I and strength of the battery be volts. Then, from Ohm's law, we have:
V = IR ... (1)
We know that when resistors are connected in parallel, the potential drop across each resistance is the same.
I  = I1 I2
I = V/R1 + V/R2
I = V/(1/R1 + 1/R2) ... (2)
From the equations (1) and (2) we have:
1/R = 1/R1 + 1/R2  

As shown Resistance 2Ω and 3Ω are in senies 

We know resistance in series arrangement can be obtained as `R=R_1+R_2` 


\[\text{ Since this 5 \Omega is in parallel with another 5 \Omega resistance therefore total resistance can be obtained as }\]

`1/R=1/R_1+1/R_2   "Here"  R_1=5`Ω `R_2=5`Ω 


\[\frac{1}{R} = \frac{2}{5}\]
\[ R = 2 . 5 \Omega\]
`"Total resistance of combination = 2 . 5 \Omega}"`

 The current shown by the ammeter A, i.e. the current in the circuit can be calculated as:  




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Lakhmir Singh Class 10 Physics (Science)
Chapter 1 Electricity
Q 34
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