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Unformatted text preview: Lab 3 Electric Circuits Part 1 Lab 3 Report (100 points) Name: 1214 PHYS Day and Time: Station Cheekin:
sten J2 ‘2 a; 7‘ ,5
iii ﬁi'f“l\‘;>x:“¢ y k Filament L1 (A Resistance
(9) Power (Watts) I How did the color of the ﬁlament and the brigh
voltage through the bulb. (2 pts)
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(9) Power (Watts) 39 tness of the bulb change as you increased the Lab 3 Electric Circuits Part 1 \ I How did the color of the ﬁlament and the brightness of the bulb change as you increased the '\
voltage through the bulb. (2 pts) \ {45.2 f as. r ., I‘: _ ' 333 a k" ll? 3 f ﬁr r‘giﬂﬁ
g L t
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f j t J, I How do the brightness changes and colors for the carbon bulb compare to the tungsten?
(2 pts) W’ i 1
_‘ , M . v M *1 ‘3‘ i f Li. n *1 J ‘ i a, ‘1 a 3" L f 1 / t g or i 1;: t 3 i» mi *3 " mi Resistance (9) Power (Watts) Questions and Exercises 1. Calculate the resistance(s) of the light bulbs and the Wire wound resistor for the various
voltages and currents recorded in Tables 1, 2, and 3. Record the calculated values of
resistance in Tables 1, 2, and 3, respectively. Show Work for l. (4 pts) 0 " ’ W
, N W’ M
I ‘ i x .1) f f’” 2“. site/1 i :W/
I x E I ,ﬁxhwim‘DWD7 40 Lab 3 Electric Circuits Part 1 2. Show that the unit of power, the watt, is equal to the product of the unit of current, the
ampere, and the unit of emf and potential difference, the volt. (3 pts)
C X
‘3 = watts (amps) X (volts) = wire wound resistor for the various I Calculate the power of the light bulbs and the
ated values of voltages and currents recorded in Tables 1, 2, and 3. Record the calcul
resistance in Tables 1, 2, and 3, respectively. Show work for 1. (4 pts) electrical circuits takes the form of power supplied to the t. Your current vs. voltage data and
increased the 3. Conservation of energy applied to
circuit equals power used or dissipated by the circui
power calculations show that the variac supplies more and more power as you voltage across the terminals of the variac. I How is the electrical energy supplied by the variac dissipated by the light bulbs? (4 pts) lbs use more and more power? carbon ﬁlament light bu
lor of the ﬁlaments and the I Do the tungsten ﬁlament and
f your observations of the co Explain your answer in terms 0 brightness of the bulbs. (3 pts) ’ I; I r ,, ,H V65 3 4‘7 If X. 0‘9"; at?" If x r . .
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z" 41 Lab 3 Electric Circuits Part 1 4. Which of the three circuit elements clearly obeys Ohm’s Law?
I Explain your answer in terms of the current vs. voltage data for the circuit element and
in terms of the calculated values of resistance in the tables. (4 pts) v‘ al r' w. x”: if " 1 “: ‘p 5  “I . q
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if w r
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1' l
y ,, ,r ..
g 55 “I ** r dwrév 4 v / ’ / I Determine the resistance of the circuit element from the slope of the line of best ﬁt to the
plotted current vs. voltage data. Note that the slope of the line of best ﬁt is not equal to
the resistance of the circuit element! The slope calculation procedures outlined on page
8 of the Graphical Analysis of Data Section must be strictly adhered to in order to
receive any partial credit. (10 pts) R= 623339 I Calculate the percent difference between the value of the resistance as determined from
the slope of the line of best ﬁt to the current vs. voltage data and the average of the
calculated values of the resistance in the tables. Show your work. (2 pts) % zjﬁxﬁ‘ : /pg3mé§ Weave f \ {$1 ’2. .8 Z " a __._x—»——""““““?
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This note was uploaded on 01/10/2012 for the course PHYS 2114 taught by Professor Bandy during the Spring '08 term at Oklahoma State.
 Spring '08
 Bandy

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