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CBSE Class 12-science Answered

Pls solve it
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Asked by Vijaybhan07 | 02 Oct, 2018, 04:41: PM
answered-by-expert Expert Answer
The given circuit is redrawn in the figure shown in order to calculate the equivalent resistance.
Equivalent resistance can be worked out as (42/31)Ω.
 
total resistance in the circuit including internal resistance of battery = (42/31)+(2/3) ≈ 2Ω .
 
current in the circuit begin mathsize 12px style equals fraction numerator 1.8 over denominator open parentheses begin display style 42 over 31 end style plus begin display style 2 over 3 end style close parentheses end fraction space almost equal to space 0.9 A end style

voltage drop across resistance network = current×Equivalent-Resistance = 0.9×(42/31) V
current through 3Ω resistance begin mathsize 12px style equals space fraction numerator 0.9 cross times 42 over denominator 31 cross times 3 end fraction almost equal to 0.41 A end style
power disspated in circuit = i2 × R = 0.9×0.9×2 = 1.62 W
Answered by Thiyagarajan K | 02 Oct, 2018, 10:02: PM

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