Circuits Testa O

1 fo 3 - Chose fhe ferm thaf besf fifs what fhe question describes

1) ohrns of Resistonce2) Voftoge (or potentiol difference)3) Wotts of Power4) Amps of Current

D Which term best Describes the moving electrons through o circuit ?

z) Which term best describes how hqrd it is for the alactrons to f low' through o circuit ?

Which term best describes the driving ene?gy providad by the movingelectrons to move through the circuit with ?

(Or driving energy lost os they move through the circuit ?)

4

,fn the circuit shown .02 coulombs of flowing electrons move through thecircuit in on minute (60 sec.). How mony Amperes of current flows throughthe circuit ? (Remenber I nilliAnp = lXl73Anps OR 0.001 Anps)

1) 0.33 mi l l iAmps2) 0.00033 mil l iAmps3) 12 mi l l iAmps4) 0.012 mil l iAmps

E ) lRef erring to guestio n 4,lf the temperoture of the circuit went up the

Amount oi coulombs/second f lowing out of the bottary would -

f) f,^.. e(|re o , - - . : - + L . 5 . , ^ €f i€nct t t t I b l c

n De<"east,

Charge flowing at the rate of 2.50 x 1016 elementary charges Per sec11!'ls equivalent to a current of

trl z.So x 10rs A (3) 4'00 x 1{ A

i;i e;.;;. io'e (4) 2'50 x 10.3 A

Recoll 1 elementory charge is 1 electron

?)The current aaveling from the cathode to tbe

scree! in a telefuion picture tube -is5.0 x 10-5 anpere. Holv many electrpns stikethe screen in 5.b seconds?

(1) 3.1 x IOs(2) 6.3 x 10rB

(3) 1.6 x 10rt(4) 1.0 x ld

E), A complete circuit is left on for senteral minutes'

l;,,sio[ il; connecung cEPPer wire to become

iff;: il;;;;P;;d* dftl" "'i" increases'iU"'J".ttr"A te.isttnc" of tbe wire

r(1) dscreases(2) increases.(3) remains the ssme

1) Alumbum, ccryPer, gold' and nichrome ffi"""4 f""etbt'if i5 x 10-1 meter and ffi

;"":E:"iEs ffiT ;f [: ll"**nryresistanccP(1) alumiuum(9) corpper

(s) so4(4) nichrome

,|")yh"t T tire resistance at 20oC of a l.E0-meter-long aluminum conductor that has " oorr-sectional area of 1.lB x 1016 uetet'?(i) 1.87 x 10.3 Q (3) e.Za x tO-l e(2) 2.28 x 10-u e (4) r.SS x tos e

ru)'fhe table belou' lists various characteristics of two metallic wires, d and E.

(3) *

(4) 4n

Croes-Secllonal Area

(m1

Ifwte A has resistance R, then wire B has resistance

tn 44 Wbich graph best represents the relationship between resistance and length of a copper wire of uniforcrcross-sectiond area at constant temperafure?

Length .( 2 )

Length

( s )Length

( 4 )

$$$L fi[ frLfrVLan$h

( 1 )

I ?J" / , A circuit consists of a resistor and a battery.Increasing the voltage of the battery *hil"keeprgg the temperature of the circuit constantwould result in an increase in(l) current, only(2) resistance, otly(3) both cument and resistance(4) neither current nor resistance

r { ) Whet mustbe ins€rtedbetu/een poiotsA andB bestablish a steady electic "rrr*itt i:o the incom-pleto clrorit represented in the diagram belov?

n;_ll lLJ^-J

(I) sudtch(2) voltmeter(3) magpetic fteld source(4) source ofpotential difference

t f Ia- a flashlighl a battery prwides a total of 8.0rolts to e bulb. If tbe A"ibliCht bulb has en oDer-ajiagresistancc of 8.0 ohmslthe arreut thrdughihe bulb is(1) 0.30 A(s) o.60 e

(3) r.5 A(4) r.7A

)

'What is the curent in

connected to a 0.40-voltdifferenceP

250 mA40. mA

a 100.-ohm resistorsource of potential

2.5 mA4.0 mA

(1)(2)

(3)(4)

n) Tfre graph below represents--the relationship

betweln-the current ii a metallic conductor and

the potential differenee across the conductor at

eonstant temPerature.

Current vs. Potential Difference

1.0 2.0 3.0 4.0

Potential Difference (V)

resistance of the conductor is

1.0 a2,0 f,

3h 1 . 0E

5o

2.0

1 . 5

0.5

The

0(g

@ o.ro o'@ 4.0 a

rE). fui electric circuit contains a variable resistorconnected to a source of constant voltage. As theresistance of the variable resistor is increased,the power dissipated in the circuit

(1)(2)(3)

decreasesincreasesremains tle same

t1) The resistance of a 60.-watt liehtbulb operatedat l20 rclb is approximately(1) 7s0o(2) 240 n

(3) r20 o(4) 60. n

fn a seria. circuit containing two lamps, the bat-ll?:upptio a potgnual difi";;;;;fiJ;il.u. ure curcnt in the circuit is 0.10 ;pd-;;what rate does the cfucuit use eae1ry?

r -- -, r-

(1) o.ors w (3) 1.5 W(2) o.rsw (4i it#

zo)

Lt/ .An electric drill operating at 120. volts draws a current of 3.00 amperes. What is the total amount ofelectrical eneiry uied by [tre drill during 1.00 minute of operationp

^

(r) s.16 . lq I v

(ii r.uo . te I(z) 2.40 x td ] (4) 4.00 x tor i

,-Z) l{ g" potential diff-ereace applied to a fixed

fitrLT$#double4 the poilier a""n"t(Y(l) remains the same (B) halrres(2) doubtes t*j dd*pl*

T

l 1 3L J "|. L7

For the following circuit -

K, = /6st-

_.r fs the circuit series or porollel ?arl

, {) Whqt is the totol combine or eguivolent resistsnce of tha circuit ?" r/

' ) o , l t ,7 ,ah^ts ) av 6hn ,

9 6 a n ^ :

L5) Whqt is the current lowing in the L2 ohmresistor ?

) o ,zs A^ys

L6)

, o,f'/A^F, .V o-07 A^p:t o"Ts ln pt .

9 l 2 6 o t , ^ 3

Compored to the voltoge lost (or potentiol differanceocross) the 12 ohmresistor, the voltoge lost in the 36 ohm resistor is -

, 6 , r o l " . , ru t , T t , n i o ^ e

Z7) Compored to the current f low through the 12 ohm resistor, the current f low'

throughthe 36 ohm resistor is -

) 6 r e o l r - , L e s s , f t , S o ' n e

R,=.lc*

zs) fo r l) tI

For the circuit shown -

Ru= lJo *

7A) Is the circuit series or parollal ?

71) Whot must be the voltoge (or potential difference) of the boftery ?

) 6 vqtts z ) / zov " l t s

3,

) 6o Vo l ts

What is the current flowing in the 30d ohm nesistor ?

r \ t ) l , ( A ^ , o s' / O . f A^ f

t a , E A n f t

Whqt is the totol or equivolant resistonce of this"circuit ?

l!-,r0,).,r|'f ,,'^

; : o.8^^t

3 )

r)t H O e h n J , T j o h ^ t

n ?lo v" lts

1) 2 , 0 A n y s

, G O o h n s, J 0 0 e h n l

has the smallest equivalentWhich circuitresistanceP

rltl-rt tHAA-J| 2 f l IHAAI

2 Q

O

6) In the electric circuit diagram below, possiblelocations of an ammeter and a voltmeter areindicated by circles L,2, g, and 4.

Wherd should an ammeter be located tocorrectlv measure the total current and whereshould a voltmeter be located to correctlymeasure the total voltageP

(1) ammeter at I and voltmeter at 4(2) ammeter at2 and voltmeter at 3(3) arnmeter at 3 and voltmeter at 4(4) ammeter at I and voltmeter at 2

Gq Three resistors,4 ohms,6 ohmsrand I ohms, arev connected in parallel in an electric circuit' The

equivdent resistance of the circuit is

(1) less than 4 Q(2 ) be tween4Qand8Q(3) between 10. Q and 18 Q(4) r8 a

In which circuit would current flow through resistor Rr, but not through resistor R, while switch S is open?

( 1 ) ( 4 )

Rl

f---{ A-l

l_ . lI )+AAr-J

R2

( 3 )( 2 )

t A 9.0-rolt tattery is connected to a 4.Gohmaad a 5.0-ohm resistor as shoum in the

aiagram belor.

4.0 fl

9,0 v s.0 5l

lVhat is the ctrreut in.the 8.0-ohu resistorp(r) r.o e(z) r.8 a

(3) 2.3 A(4) 4.0 A

, In the.circuit diagran shonn belon', amrreterhbt€rcds IU, emperes. :"if

10 .A

What is the reading of ammeterAo?(1) 6.0 A(2) 10. A

(3) 20. A(4) 4.0 A

. L o'L7

Alternafe 23 to 31

For the circuit shown - The totol current f lowing out of the bottery is'P}},J Amp t.

-{r",rfi,.:s A-f

/ Zt/u/f =

z3) wnat

d

R" lo&'*

is the voltage drop (or potentiol differenceoryoss) Rr=50 ohms

),5 V" I fs , l v o t t s

, t v " l [ 5

Z'{) Wfrot is the current f lowing through resistor Ra ?

) o , l s A^ f s ) ) on 6 A^ys

, a , 3 A ^ , a ,

7 g) Whot is the volue for resistor Ra ?

r) Z J -n ;) l$o-n

! ) tz u. / / :

1) ). 2 A^F,

) i a ' . 9 Yoo&

7L) Tt o forth resistor were odded to this circuit how would that eff ecthe voltoge dnop (or pofentiol diff erenceocross) in the 100 ohm resistor Rs ?

, T n ^ n " . . r u ; 1 ,

, D r . . € q s e ; l

, N" eff'^l^

R,'-5o:t-

11. ,/ /dc J\

- . | " ? lL l /

For the circuit shown -

l "sv

.2.7 Whot is the totol or eguivolent resistonce of the circuit ?

D 2 5 n ^ , t 2 5 s z

z ) 7 s 4 "t) ZzS -ru

78) compored to the voltoge drop in Rr=75 ohms, the voltoge drop in'

Rs : 150 OhmS iS - (Remember voltage drop in o resistor is some os potentiol difference across)

) Z t l ^ e r J - o l l e . 3 ) f h * i a ' h €

\ t zx G-e '^ [u 'n

21) Compored to the current f low in Ra=50 ohms the current f low in' R, ?=150 ohms is -

D 3 f i ^ r s s . . . , l / u , 3 ) T h ' 5 e ' t e

z ) 3 X 6 . o o t u ^ .

3q Tf a 4rh resistor were oddedcurrent in R3 =l$9 ohms would

in porollel to the ihree olreody therethe

B e) 3 ^ ^ l l e . s) H'"Lrf:t

, B t\ ) Lo .3c .

?l) Tf o4th resistor wereodded in porollel to the three olreody therethepower" / Used up or dissipoted by the circuit would -

) g ep) Bu l^t- "

3.t ,^, CA q r e

z) bu L ess

!

Lo^3 l . rob le " � s

A

6o

Base your ansurers to questions 59 and 60 on the information and diagra"rr belor'

A 10.0-meter length of copper wire is at 20oC. The radius of the wire is 1.0 x 104 meter'

Section of CoPPer

@r = 1 . 0 x 1 0 a m

59 Determine the cross-sectional brea of the wire. tll

60 Calculate the resistance of the wire. [Show all worh including the eqpation and substihrtion with units']

Cross Wire

4

i ot ' Scct^1-tdr.r'

L ) J r e ' t

Lms1

P . . , b l e -

Base your answers to questions 48 through 51 on the information, circuit &agram, and data table below'

In a physics lab, a student used the circuit shown to measure the current th19-ugh and

th" p".";ffi ;;;;;;;;;.;tistor of unknown resistance, fi. The instructor told the stu-

J;;il.;;;A;#t"h ;; "perate the circuit only long enough to take each rea&ng' The stu-

dent's rneasurements are ibcorded in the data table'

- _ - irgctiorw (4&50): Using the inforsratioa in the data table, construct a graph on the grid in gour an'saoer

booklet, following the directiois below

48 Mark an appropriate scale on the axis labeled "Potential Drop (V)'" [ti

49 Plot the data points for poteatial drop versus current' tr]

50 Draw the line or curve of best ftt. It]

51 Calsulate the slope of the line or cuwe of best fit' [Show all work, including the equation and substitution

with units,l tgl '

1.0 2.0 3.0 4'0Current (A)

g 'oor!.EEooA

DataTable

Current(A)

PotentialDroP(v)

0.80 21.4

1.20 35.8

1.90 56.0

2.30 72.4

3.20 98.4

Potential DroP vs. Current

51

* r OA 6-ohm resistor and a 4-ohm iesistor areconnected in series with a 6-volt battery in anoperating electric circuit. A voltmeter isconnected to measure the potential differenceacross the 6-ohm resistor.In the space in qour affilI)er booHet, draw adiagram

-of tnir lircuit including the batterry

resistors, and voltmeter using symbols from thefuference Tables for Physical Saning/Physics,Label each resistor with its vdue. lAssume theavailability of any number of wires of negligibleresistance.l [s]

F i ' s l D " " , - j . r r f 1 i - " r i l , ^ z i l 1 , o , . ^ l n c l e r

N o n J r o v , J ; [ \ n e l c r

u l lJ ,

Base your answers to questions 67 through 69 on the information below

A 5.0-ohm resistor, a 10.0-ohm resistor, and a 15.0-ohm resistor are connected inparallel with a battery. The current through the 5.0-ohm resistor is 2.4 amperes'

67 In the space in your a,nsu)er bookla, using the circuit symbols found in the Reference Tables for Phgsical

SettingtPhysics, draw a diagram of this electric circuit. [t]

68 Calculate the amount of electrical energy expended in the 5.0-ohm resistor in 2.0 minutes. lShow all work,

inclu&ng the equation and substitution with units.] lz]

69 A 20.0-ohm resistor is added to the circuit in parallel with the other resistors. Describe the efFect the

addition of this resistor has on the amount oi electrical enerry e4pended in the 5.0-ohm resistor in

2.0 minutes. [t]

6 7 -

( a -

6 7 *

To: I Aasxtees

I ,-'/L - l, ' 2 " " 11 - f5 - L

4 - 37 - 36 ^ 7

1 - Yt o - J

u - lIA .Jl , " tt ' t - 4t 5 ' z

14 -,- ll 7 * z ^

t a - l

tc t -z

Zct -Z

? .1 - |

2 \ - 42 7 ^ J e r2 1 ^ 3

2t- J

Lc. - l

2 7 ^ r ,/ t - pq "c

2 1 - j

J o ^ l

t t - y _ / 4 - tt L - \ J 7 _ tt r - t

3 r - t3 t - t

t{{telao^ L

7 r - l 1 7 - l2 ' l - Z 2 8 - J2 t ^ ) Z . r - t7 4 - l 3 a - l

1 t - I

La"j

op.5l I ea1 5

f r e o 2 7 [ r \

e J . t - t ( t ' t o

0 . - 6R"( h = / "72* 'o ' . - ' ^

( , ^ )

f f io ' . = .

6 j5-n6 d --11 ' , ) . t v ruJ . .

Vtu867aL4j o4a, dz d lt a l

gf , -T ,

J l a y e . T q- 4 - 75 -rL

4\/

ca - *"y,a (c)6 ? ^

e 7

,l

( D . o t t n < . e < L 5 c

\ 7o t " u"J

-("rn)Ttd(,*,;, 3 YSG j.'., la;

/U" *ff i*/ d4 5tz; ,J; v ;J u*ll ,7

h:;J