Two similar cells are used to light two similar lamps as ...
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?
P
Q
R
S
Correct answer is B
The determinant of the brightness of a bulb is the power (watts) of the circuit.
Recall that Power (P) = V2R.
Since the resistance is to be used as a divisor, it means the smaller the resistance, the greater the power.
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