Question

A bulb is rated at 4W, 10V. (a) find the resistance of a bulb and save current for its maximum glow. (b) how can you run it at to 2v safely? (c) find the power consumed when two such bulbs are connected to 5 volt supply in series and parallel

Answer 1

p-4w
v-10v

p=vi
I=p÷v
I=4÷10
i=0.4