Download Unit 8 Practice MC Solutions

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