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If two household lightbulbs rated 60 W and 100 W are
Chapter 21, Problem 9(choose chapter or problem)
Problem 9CQ
If two household lightbulbs rated 60 W and 100 W are connected in series to household power, which will be brighter? Explain
Questions & Answers
QUESTION:
Problem 9CQ
If two household lightbulbs rated 60 W and 100 W are connected in series to household power, which will be brighter? Explain
ANSWER:
Solution 9CQ
Two household light bulbs rated 60W and 100W are connected in series to household power supply of 220 v. Since the bulbs are in series therefore the current is same for the both bulb.
P = V2 / R
The resistance of the 60W bulb is calculated as,
Substitute 220 v.for V and 60W for P in equation,
P = V2 / R
R60 = 806.7 Ω
The resistance of the 100W bulb is calculated as,
Substitute 220 v.for V and 100 W for P in equation,
P = V2 / R
R100 = 484Ω
Therefore, the total resistance is calculated as,
R = R60 + R100
Here,R60 is the resistance offered by the 60W bulb and R100 s the resistance offered by the 100W bulb
Substitute 806.7 Ω for R60