2017 · Q9
Suppose voltage V is applied across a resistance R and the power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be
General KnowledgePhysics
- AP
- B3P
- CP/3
- D2P/3
Explanation
Three equal resistors R in parallel give an equivalent resistance of R/3. Power dissipated is P = V²/R_eq = V²/(R/3) = 3V²/R = 3P. Hence B.