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Consider a simple circuit shown in figure stands for a variable resistance R. R can very from R_(0) to infinity. r is internal resistance of the battery (r lt lt R lt lt R_(0)) . (a) Potential drop across AB is nearly constant as R' is varied. (b) Current through R' is nearly a constant as R' is varied. (c) Current I depends sensitively on R'. (d) I ge (V)/(r + R) always. |
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Answer» Potential drop across AB is nearly constant as R' is varied. In parallel connection of resistors equivalent resistance is smaller than smallest VALUE of resistance. Potential difference is obtained across AB and r. Equivalent resistance of R and R. is always smaller than R. HENCE , I `ge (V)/(r + R)` and as equivalent of parallel connection of R. and R is less than R and nearly EQUAL to R. Hence, variation in R. won.t CHANGE p.d. across AB . |
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