College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 38PE
Integrated Concepts
(a) Redo Exercise 20.25 taking into account the thermal expansion of the tungsten filament. You may assume a thermal expansion coefficient of 12 × 10-6/°C. (b) By what percentage does your answer differ from that in the example?
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Integrated ConceptsHow much time is needed for a surgical cauterizer to raise the temperature of 1.00 g of tissue from 37.0oC to 100oC and then boil away 0.500 g of water, if it puts out 2.00 mA at 15.0 kV? Ignore heat transfer to the surroundings.
An old light bulb draws only 42.5 W, rather than its original 60.0 W, due to evaporative thinning of its filament.
By what factor is the diameter of its filament reduced, assuming uniform thinning along its length? Neglect any effects caused by temperature differences.
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Tap circuit element to edit.
PKET :
Circuit Construction Kit: DC
Lab
So, we have three lightbulbs (resistors) all in a
series where the current only has 1 path to
follow.
The 15 volts of potential energy supplied by
the battery will divide among the 3
lightbulbs. However, will it divide evenly?
Question: Do you think the 15 volts of
potential energy (per Coulomb) supplied by
the battery will divide evenly at a 5 volt drop
at each of the lightbulbs? Why or Why not?
Let's solve the problem mathematically
before we close the switch and measure the
current and voltage at each resistor.
The strategy to solving these problems is to
combine all the resistors into 1 total resistor
using the equation above. Then use Ohm's
law to determine a current, then analyze
each resistor with the now known current to
determine the voltage drop at each individual
lightbulb (resistor).
Step 1: Calculate the total resistance of the
Chapter 20 Solutions
College Physics
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