- #1
Normalization
- 23
- 0
Homework Statement
I've done both these questions with correct answers, but I just want sure that I chose the right choices for the right reasons. The questions are:
Homework Equations
V = IR
P = I2R
P = V2/R
The Attempt at a Solution
The answers for both are D.
The reason I chose D for the first one is because P/I2 = R And due to Ohm's law R is constant, so I2 = P So the graph should look like a y = x2 graph.
The reason I chose D for the second one is because the brightness of the lamp depends on the power output so since P = I2R an increase of I (Due to Kirchovs first law) across L would mean a larger power output across L, and a decrease in I (because of the increase in R across the parallel part) across N would mean due to the same equation that P would decrease. For this particular question is it 100% necessarily to use the power equations or could you just say that a larger current means a greater brightness and then just deduce the answer from Ohm's law because the Examiner's report didn't mention anything about using the power equations...