Name:
Test on
2010 - vet
B
Period
Burns
Date:
CP Physics
Multiple Choice: Identify the choice that best completes the statement or answers the question. Fill in the
corresponding o~al on,your Scantron sheet.
1. Materials whose resistance changes when voltage varies are called:
a
ohmic.
b
inohmic.
d
e
deohmic.
ohmless.
2. If the voltage across an ohmic resistor is doubled, what happens to the current through it?
b
It quadruples:
c
d
e
It halves
It is quartered.
It depends on the resistance.
If RI < R2 < R3, and if these resistors are connected in seriesin a circuit, which one has the highest voltage?
a R~
b R2
d
e
All are equal in voltage.
More information is needed.
4. How is current in a light bulb measured?
a A voltmeter is placed in series with the light bulb.
b A voltmeter is placed in parallel with the light bulb.
O An ammeter is placed in series with the light bulb.
d An ammeter is placed in parallel with the light bulb.
5.Which of the following will successfully light the bulb?
6. What are the charges shown in the electric field line diagram above?
a G, H and I are all negative.
b G and I are negative and H is positive.
c G and I are positive anckH is negative.
G, H, and I are all po’sif~ve~.
7. What are the relative magnitudes of the charges in the diagram above?
a G>H>I
c
8.
Which of the schematic diagrams represents this realistic draWing of a circuit?
d
Use this chart to decode resistors:
9. What is the resistance of a coded resistor with the bands: gray - violet - yellow.
a 87 £2
b 874 £2
For questions #10-11: Three identical light bulbs are connected to a battery as shown below. W,
X,Y and Z represent locations along the circuit.
10. Refer to above diagram. Which adjustments could be made to the circuit that would increase the current
being measured at X?
a Increase the resistance of one of the bulbs.
b Increase the resistance of two of the bulbs.
e Decrease the v
e of the battery.
In-n-C-r~rease
the
voltage of the~
~
Remove one of the bulbs.
11. Ref~izgrnrn ~i~’h one of~ollowing statements is true?
f All
bs will have the same brigffttres~
~ff~’-~--he bulb betw~l ~ ~t.
~ The bulb between Y and Z will be the brightest.
d The bulb between Z and the battery will be the brightest.
12. Two charged particles held near each other are released. As they move, the acceleration of each decreases.
~~es have
c-~" Opposite signs.~
P the same sign.
charges that can not be determined.
13. In order to form an electric circuit, you need to have
a wires or conductors to connect everything.
b a power source.
c a light bulb or some resistance.
d a complete path for the current.
14. When resistors are put in series next to each other, their overall resistance is
a the same as the resistance of an~ ~’th~ r~i~
~the resistance of any individual resistg~
~ smaller than e resis nce o any of~l~e resistor~-.’
15 .W~gseveral light bulbs bums out
~s ~n tlae rest ot the clrcuit.
~her light bulbs bum brighter.
16. Two lamps, one with a thick filament mid one with a thin filmnent, are connected in series to a battery. The
across the lamp with the
~
r~ t~nt.
c Voltage is the same for both.
17. In a good insulator, electrons are’usually
a not moving at all.
b free to move around after an imp, urity has been added.
c free to move around
tightly boun~
~
e semi-free to move around.
18. Electrical resistance in a wire depends on the wire’s
a thickness.
b resistivity.
c length.
~e
19. Electrical potential energy is the energy a charged object has because of its.
a momentum.
d
e
motion.
volume.
20. Coulomb’s law says that ttae force between any two charges depends
a directly on the size of the charges.
quare of the dis’iance between the charges.
~~
Problem ......
1. Draw the continuous conducting path that will enable all 3 light bulbs to light. Be sure to trace the CCP
through the bulbs and batteries.
~
2. Which bulbs will light? Trace the CCP through the bulbs.
Bulb ~ Unlit
Bulb 2~ Unlit
3. Use the above circuit to answer the following questions. You may find it easier to make a VIR table to
organize your work. Don’t forget UNITS!
Wllat is the equivalent resistance of the circuit? Put another way: how much total resistance
does the battery have to push through?
What is the current through the battery?
102_
Wlmt is the current through Ri?
O~O~A
What is the current through R~?
What is the current through
o,oz._A
What is the voltage across Rl?
What is the voltage across R27
What is the voltage across R3?
3,4s V
o ~oao
0,0ao
4. 4 amperes flow through a 12-ohm resistor.
a) How much voltage is required?
b) How much power is dissipated?
c) How much energy is used up in 1 day? (Put your answer in kWh.)
= ’--t.61 P_ca,
d) What is the total cost for a day of use ifPSE&G charges 10 cents per kwh?
Two identical spheres each carry a charge ~f-40.0/~C. The spheres are separated by 1.20 m.
a) what is the electric force between tbem?~
K~ = i~ $, ~_~ :(q~ Io~ ~-4o~o-~) = I O ~
] b) Is the force attractive or~
I c) In order to have a force 1/4th as large, would you move the charges closer together