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Unformatted text preview: PHYS 0175 S rin 2008 — Worksheet Problem Set #7 Part A ?a C E H L E TA; Score: Your Name: Consider the circuit shown in the diagram below, with the resistors having values R1=7.OOQ, R2=12.OQ,
R3=18.OQ, and R4=24.OQ. You are also told that the current through resistor R1 is l1=2.50A. Determine
(a) the currents that ﬂow through each of the other three resistors; (b) the emf E of the battery, which you
may assume to be ideal; and (c) the equivalent resistance of this combination of resistors as seen by the
battery. (1) What is the fundamental relationship between the V
voltage V applied across a resistor R and the current
I passing through the resistor? : I (cl/mfg Law) (2) How does the voltage across R1 compare to the ' t V . M ,_ {7 a 0
voltage across R2? V2. 1 hunt see l\( Md R Z— (bnre QM ,6”ng , (3) What is the relationship between the currents __ .
through R and R2 and the current through R3? J (~ “LI; 2 :5 bkécbu, 5( (‘ LL64}? {g C M ’ (4) What is the voltage across R4 and how does it
compare tog? ‘ _ , .
\/;{ = vi 4* \/_5 : (5) Now you are ready to answer the questions. I V
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R3 R4 PHYS 0175 S rin 2008 —Worksheet Problem Set #7 PartB Your Name: ,9" (<0 E HL E Q Score: An emf source with E=120V and negligible internal resistance is connected through a switch 3 (initially open) to a 6.50pF capacitor (initially uncharged) and an 8.50m resistor in series. Determine the voltage
drop across the capacitor (Vc), the voltage drop across the resistor (VR), the charge on the capacitor (q),
and the current through the resistor (I) at the following three times: (a) at the moment when S is closed to
complete the circuit (to=Os); (b) at time t1=5.0.0x10'3 s; and (c) at time t2=150x10'3 s. S
(1) Draw a diagram of this RC circuit. /
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(2) What is the time constant of this circuit? Is the C" capacitor charging or discharging? _ g . ,7 e‘ m n
ce Q<:([email protected]?xw ):?E;3:£;§
%C a : C 61 (Fat 4%? (3) What equations describe how the current I through the resistor and the charge q on the capacitor 3: (3,
change with time? R (4) What is the relationship between V0 and q? What is the relationship between VR and l? V Q t ‘ . ‘ 't/ec .
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(5) Now you are ready to determine all of the quantities v ‘ _ J KC you are asked for at the three different values of VR 3 ‘1“ R ' C time t. a ‘ I ~ ‘, v ‘ :  I /
(a) Odl' tc : (7s. '* \/;‘/ " VK" (20" , E
(4 : O /r l : ——€— : {LIL— ( “(A ...
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 Spring '08
 Koehler
 Physics, Work, Resistor, 4%, Electrical resistance, 5w

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