Question
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$1.00 Filament
- From Physics: General-Physics
- Closed, but you can still post tutorials
- Due on Jul. 14, 2009
- Asked on Jul 11, 2009 at 4:39:28PM
Q:1. Here you see a 80-watt, 120-volt light bulb. The coiled tungsten filament of the bulb is 2.0 m long, and it heats to 3000° C during normal operation.
What is the cross-sectional area of the filament?(a) Find the cross sectional area of the filament. (b) Assuming that the filament has a circular cross section, find the diameter of the filament. (c) Find the resistance of the filament at the operating temperature of 30000C and the (d) current flowing through it at that temperature. (e) Would the current be different at different temperatures, as the filament heats up to its operating temperature? Explain why.
