Pre-Lab Questions: Practice with Ohm’s and Joule’s Law
Pre-Lab Questions: Practice with Ohm’s and Joule’s Law
(Show Work)
1) Bulb 1 operates at 3 watts and has a nominal resistance of 12 ohms.
What is the operating current? __________________________________
What is the operating voltage? _______________________
2) Bulb 2 operates at 3 watts and a voltage of 14 volts.
What is the operating current? __________________________________
What is the nominal resistance of the bulb? ________________________
3) Which bulb should result in the lowest line losses? _____________________
4) Given wire with the following properties, what is the total resistance?
ρcopper = 0.67 x 10-6 Ohm-inches
L = 150 feet
AWG 26 wire (diameter = 0.0159 inches)
Rwire = ______________________
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