Solution:
Suppose resistance R is connected in series with bulb. Current through the bulb,
Hence for resistance V = iR
If a 30 V 90 w bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb?
If a 30 V 90 w bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb?
