The wattage marked on a lightbulb is not an inherent property of the bulb but depends on the amount of voltage to which it is connected, usually 110 V or 120 V.
a. Calculate the Current through a 40-W bulb connected to 120 V.
b. Calculate the current through the same bulb when it is connected to 60 V.
(a)
To find: The current though 40 W bulb
Explanation of Solution
The current though 40 W bulb is
(b)
To find: The current through bulb when connected to 60 V
Explanation of Solution
The current through bulb when connected to 60 V is
Chapter 34 Solutions
Conceptual Physics: The High School Physics Program
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