Ohmts Law
l. What is the resistance of a toaster if a current of 12.5 A flows through it when it is connected
to 120 V?
Work
Formula
Final Answer
qbQ
R--i
,a
A light bulb has a resistance of 90 Q. What current flows through the bulb when it is
connected to 120 V?
2.
Formula
Work
Final Answer
tZt
-r/
JR
'.'7
t
3. A current of 0.50 A flows through a light bulb that has a resistance of 18 f,l. What is the
vo
across this
bulb?
Formula
V=
4.
I(
Work
/ . (o,EAfrg on) -fr
Final Answer
4?
4or
A flashlight bulb has a resistance of 4.0 Q. What current passes through the bulb if it is
connected to 3.0 V?
Formula
TJV
5.
Work
/
Final Answer
0 7(A
4
?
What potential difference is nec.essary to produce a current of 0.60 d in a load that has a
resistance of 25 Q?
Formula
/ =f (
Science 9
Work
Final Answer
f?
l/ =
o Physicso Assignment
(0, 6alQEO)
t
/{(
o/,,
Pagel
6. The
current through a load in a circuit is 2.5 A. If the potential difference across the load is
7sV.what is the resistance of the load?
Work
Formula
p. -s -L
I
75
n
Final Answer
(
K=m=3oCt
3o
(\
t
7. An 80 V potential difference is measured across a light bulb that has a resistance of 16 f,t.
this lisht bulb
What is the current th
Work
Final Answer
Formula
T+v
8. A 25
V
r = -f#= sA
a300Q
mA current flows thro
V
l=-
gA
across the la
7SV
= ( o, 02 s a)(eoo n)
9. A siren has a resistance of 12.0 Q.
120 V?
J-R
What is the
't /?'
2,,
What current passes through the siren if it is connected to
/
/o A
A of current are flowing through a conductor that provides 18 f,l of
,l
resistance. What notential difference does the
10.
In
a portable radio, 0.50
Work
Formula
t/= TR
Final Answer
V = (o;{A)(rf n)= q(
/)
a
4v
!
11. A clothes dryer uses a 220V power source. The coils of the heater provide an average
the
coils?
resistance of 12 (1. Wha amount of current is llowinp th
Formula
7=--L
+&
Science 9
o Physicsr Assignment
Work
I-
Final Answer
2zo rl
(2"{> = ri,7a
/tr, 3A
.
n
Page2
/, t
t2. Anautomobile headlight nas ao average resistance of 24 dL.Car batteries provide
dill-erence oI12Y. What amount of current passes throueh the headlieht?
Formula
Work
+r/
I
T=
-J_
=-
Final Answer
/2v
O,SA
2rl cL
13. A current of 2.5 x 10-3 A passes through a portable music playen
the device, what is the resistance within the circuit?
Formula
R= L
T
If
a 9.0
Work
R=
a
V battery operates
Final Answer
4v
= 3{e
0,oo2S A
3boo
-()
n
An electric motor has an operating resistance of 25 Q when a 4.8 A current is flowing
th
it. What is the potential dill'erence of the outlet the motor is nlussed into?
14.
Formula
V=TR
Work
Final Answer
V e (4-3t)(ze n)= /zov
4
/20 r'
A 9.0 V battery maintains a current of 3.0 A through a portable radio. What is the
resistance of the conductor?
15.
Formula
Q= -L
,-t
Work
p=
Final Answer
%= so
3
30-
16. An automobile headlight has a resistance of 40 Q when attached to a standard 12 V battery.
How much current flows throush the
T+v
t7. wh
what
V
.
A
.,t
= 0.3A
0.3 A
is the
th resistance of a hair dryer plugged into a 110 V outlet with 10 A of current?
Formula
2;
,z
Science 9
/2v
I= ffi
r
-L
Work
P='iil,'
Physicsr Assignment
Final Answer
//n
//{).
o
/,t
Page 3