Two similar cells are used to light two similar lamps as illustrated in the diagrams above. In which of the circuit diagrams are the lamps brightest?
-
A.
P -
B.
Q -
C.
R -
D.
S
Correct Answer: Option A
Explanation
The determinant of the brightness of a bulb is the power (watts) of the circuit.
Recall that Power (P) = (frac{V^2}{R}).
Since the resistance is to be used as a divisor, it means the smaller the resistance, the greater the power.