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Unformatted text preview: a) What is the total stored energy in joules? b) Suppose all of this stored energy is used to power a 60 W light bulb. How long can the light bulb be operated? 2. An engineer is designing a 2 kW heater element for a furnace. The heater element needs to operate from a 220 V source and is to be made from 18 gauge nichrome wire (0.040 inches in diameter). The conductivity of nichrome is 0.9 10 4 1/ cm. a) Determine the current flowing through the heating element. b) Determine the length of the nichrome wire required. c) Would it be practical to use copper wire for this heating element? Give one or two reasons to justify your answer. From Chapter 1 in Semiconductor Devices and Technology Problems 2, 3, and 6. (physical constants are on page 43)...
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This note was uploaded on 09/20/2010 for the course ECE 18202 taught by Professor Kumar during the Fall '08 term at Carnegie Mellon.
- Fall '08