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ID: A Date: Class: Unit 8 - Circuits - Practice Multiple Choice Multiple Choice Identifu the choice that best completes the statement or answers the question. 1. In which of the circuits below are the ammeter and voltmeter correctly connected in order to measure current through the light bulb and voltage across the light bulb? A. B. * v o\'\'tvr-4.-LL"\-^: '*X:rl,;u-fJ -.l4lg.Lr-tr'--.^r.''.-s-tj?''t\-'J | \'*r*r""-"r*L L--etr-t_ *r--,-{L- Ls\ *-' ,**re-'Cl-u-r z. An electric drill rated at 400 W is connected to a 120 V power line' What is the resistance of the drill? A. L/3 a B. 3/5 o c. D. 10/3 o 2O/3 o @:o o P'= cav' r{(;{'= . (tz$ :"-. t.- V=, *$=* \a\ 3 R- rz$=Lg)K,n {L i z*l(a) -,tr- (*-._.--.--) \€.3uJ-\ \.* l"-- - t ID: A Name: 3. How much electrical energy does an electric toaster dissipate each second if it draws 3 A and has an equivalent resistance of 45 O? A. 5l B. 151 c. 135 J D*27O J laV V=LK 'p= V=b6O ^\ ; f [rab) | = t35Y @)+os: * p : bl_ +- 4ffi= \^( t +o5tu^tW:zicBJ 4. What is the total current flowing in the circuit shown below? Lrz-:4fl* E I A. B. 2/3 A 4/3 n 2A 3A 4A \ur*tL= Ln, {= R",b i",(*) ) kv= L ?."-I*sL L*+ =+?3n- ID: A Name: 5. In this circuit, how much current flows through the lightbulb? Qone B. 1.25 A c. 1.5 A D. 2.0 A E. 3.0 A V.= i {t (t i.5-" t i '-- .Jb,A 6. What is the current in a copper wire that has a resistance of 2 ohms and is connected to a 9-volt electrical source? A. 0.22 amp \=ilL (*; a.5 amp V l.o amp ci= itz) D. 11.0 amp E. 18.0 amp i=4 554 7. A 100-ohm resistorand an unknown resistorare connected in seriesto a 10.0-volt battery. If the potential drop across the 100-ohm resistor is 4.00 volts, the resistance of the unknown resistor is A. 50C) B. 100 gt d,, tso o Yzooo G2V E. 600 ct \oo = L (+) i ="c.t A Q: ,u4 & ) 3 L= i6C:a_ ID: A Name: s. A 9.O-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below. 4.0 fl 5.0 fi What is the current in the 5.0-ohm resistor? Lt"-*r-,u.r-t tss.-= \ t"trt -== Vbct\ i oo (*,,v A. 0.44 A A Y. D. E. 1.oA 1.8 A 2.3 A 4.05 A t ir) -+ 9. In the circuit diagram shown below, ammete cl = {r?=4*i"6= tA- l= lAl What is the reading of ammeter Az? A. 3A B. 4A 9?f^ ttLl E. 20A R"k r.J..-! 2v '3C 1 a^, 5 (r0 e? --? U9= Y V*..y = Wrz)= \z$ v tzIu ID: A 10. If 10 coulombs of charge are transferred through an electric circuit in 5.0 seconds, then the current in the circuit is ^c, A. 0.50 A zf.t z.o a \C 1:5 s.o n b D. 25A E. 50A ll. Two resistors, R1 and R2, dre identical, butthe potential difference across R1 is half the potential difference across R2. What is the ratio of the current in R1 to the current in Rz? A. R,= Rz-= L/4 l-a- Vr= I v Vz- = 2V 91" D.2 E.4 K. S=- v.-r& !=-LR 1--t() \z i[t) [ =24 i- \ A I t1 :- Ly ID: A Name: tZ. In which circuit would ammeter A show the greatest current? t5*"5= IO-CL kA= \/'=iK 1.5v l.b = i [rf,,) i = .\bA A. u{: /)%-sL- 1.5v $..- "v/=LK I.b-= i tB) i = .1)A B. 1.5v 5lf, y;; 7;-]?w;l-y-; .r.8.= r/) ( a L:.Ge C. L _!_\ E{t"s'g'7-uls 1.5v sa r l,{: i(7*) = "qft i-: tub l,b= l* L .L .).r-i-..) ( = :t q)'s 5 s*s ? it?) t.,?*A ID: A t3. In the circuit represented by the diagram below, what is the reading of voltmeter W 10. o *r_i1-]1,t C A. 0.5 v B. 20V g.- 30 v lb s1t. 9;3V LA 2c, v \--_* )Crr-rq _; terv A circuit consists of a resistor and a battery. ').('"/nt:.i t-\0 = j6-rr- L>O: c ["c) L> '2_A 14. What happens to the power dissiBated in the resistor when the resistance is quadrupled and the voltage remains constant? V=tR A. It is doubled. B. It is quadrupled. c. It is halved. ,.+,v' 6,tlt is ouartered. Y n remains the same. oHt L=K ? t(") -; .\ ;-?- K ,z I de'\ at I ,b n$,l,.r P='t V 7 | -. ! i-l a n.1€rt I ffi'f =H TD: A Name: rs. In which of the following circuits will all of the remaining lightbulbs continue to operate if the fifth lightbulb fails? p€- CA.t-^r\$\dC