Current Electricity and Electrical InstrumentMedium
Question
A resistor of resistance R is connected to a cell of internal resistance 5 Ω. The value of R is varied from 1 Ω to 5 Ω. The power consumed by R:
Options
A.increases continuously
B.decreases continuously
C.first decreases then increases
D.first increases then decreases.
Solution
P = 
R
= 0 at R = 5Ω, so power is maximum at R = 5Ω
Therefore increase continuously till R = 5Ω.
R = 5Ω
R = 0 at R = 5Ω, so power is maximum at R = 5Ω Therefore increase continuously till R = 5Ω.
R = 5Ω
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