a student has two resistors of -2 ohm and 3 ohm . she has to put one of them in place of R2 . show by calculation which one of them she use to get a total current of 9 ampere.
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Students has to put 2 ohm Resistor in place of R2
Explanation:
Battery Source = 12 V
=> V = 12 V
Total Current = 9 A
Total Resistance = R
V = IR
=> 12 = 9R
=> 4 = 3R
=> R = 4/3
R1 & R2 are in Parallel
Hence
1/R = 1/R1 + 1/R2
=> 1/(4/3) = 1/4 + 1/R2
=> 3/4 = 1/4 + 1/R2
=> 2/4 = 1/R2
=> 1/2 = 1/R2
=> R2 = 2
Students has to put 2 ohm Resistor in place of R2
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