Solution:
For normal brightness of each bulb see following circuit. Current through each bulb = 0.5 A
So main current i = 2A
Also, voltage across the combination = 1.5 V
So voltage across the resistance = 10.5 V
Hence. for resistance,
Four identical electrical lamps are labelled 1.5 V 0.5 A which describes the condition necessary for them to operate at normal brightness. If a 12 V battery of negligible internal resistance is connected to lamps as shown, then
For normal brightness of each bulb see following circuit. Current through each bulb = 0.5 A
So main current i = 2A
Also, voltage across the combination = 1.5 V
So voltage across the resistance = 10.5 V
Hence. for resistance,