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Physics Electricity
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1.
3 points
Use Coulomb's law to calculate the value and sign of an unknown charge (q2) if the first charge (q1) is +5.7 x 10-8 C and exerts a force of 12 N causing q2 to move 5.0 x 10-4 m towards it.
q2=+ 5.8 x 10-9 C
q2= - 1.2 x 10-5 C
q2= - 5.8 x 10-9 C
q2= + 1.2 x 10-5 C
2.
3 points
Any object in which electric charge does not move freely is called a(n)
conductor
semiconductor
superconductor
insulator
3.
3 points
A device which converts mechanical energy into electrical energy is called a
Battery
Generator
Capacitor
Resistor
4.
3 points
The rate at which electric charge pass through a cross sectional area of a conductor is called.
Resistance
Current
Potential Difference
Capacitance.
5.
3 points
(refer to diagram #1 on the separate diagram sheet) In the diagram, q1 is a _______________ charge and q2 is a ______________ charge
negative, negative
positive, positive
negative, positive
positive, negative
6.
3 points
you rub a blue balloon on your head transferring electrons to the balloon. Suppose the blue balloon, which has a net negative charge, is brought near another red balloon hanging from a string. The red balloon moves away from the blue balloon. The red balloon must have a
net negative charge
there is not enough data to tell.
is neutral
net positive charge
7.
3 points
Conventional current is defined in terms of the flow of
positive charges.
negative charges
neutral charges
unequal charges
8.
3 points
(refer to diagram #2 on the separate diagram sheet) A positive test charge placed at point B will have ___________ electrical potential energy than a charge placed at point A.
not enough information
less
equal
more
9.
3 points
Metal is an example of a
semiconductor
insulator
superconductor
conductor
10.
3 points
The ampere (A) is the unit of
Potential Difference
Current
Capacitance
Resistance
11.
3 points
A 1.5 volt battery is connected to a small light bulb with a resistance of 3.5 Ohms. What is the current in the bulb? (Use Ohm's Law)
0.43 Amperes
2.33 Amperes
1.03 Amperes
0.96 Amperes
12.
3 points
____________ charge carriers will always flow in the opposite direction of current
negative
positive
neutral
unequal
13.
3 points
Two conductors transfer the same amount of charge. One conductor is twice as long as the other conductor. The charge going through the long conductor will experience ___________ resistance than the shorter conductor
less
more
equal
not enough information
14.
3 points
A small electronic device is rated at 0.25 watts when connected to 120 volts. What is the resistance of this device? (use both Ohm's Law and electrical power equations.
480 Ohms
57600 Ohms
280 Ohms
1920 Ohms
15.
3 points
(refer to diagram #2 on the separate diagram sheet) A negative test charge placed at point B will have ___________ potential energy than if it were placed at point A.
less
more
not enough information
equal
16.
3 points
According to Coulomb's law if the distance between two positive charges is doubled the ________________ force between the charges will be _______
attractive, increased by a factor of two
repulsive, decreased by a factor of four
repulsive, increased by a factor of four
attractive, decreased by a factor of two
17.
3 points
Use Coulomb's law to find the distance between two charges that exert a repulsive force of 175 N on each other. The charges are +2.4 x 10-6 C and +4.3 x 10-6 C
78 m
270 m
43 m
1884 m
18.
3 points
If electricity were compared to a water system where a pump was pushing water through a hose, a longer or a narrower hose would act as
Potential Difference
Resistance
Current
Capacitance
19.
3 points
A typical color television draws 2.50 amperes of current when connected across a potential difference of 115.00 volts. What is the effective resistance of the television set? (use Ohm's Law)
0.22 Ohms
54.06 Ohms
46.00 Ohms
287.50 Ohms
20.
3 points
When charging by induction
a charged object is grounded
two charged objects are connected by a conductor.
a charged object is brought near an uncharged object
a charged object is rubbed on an uncharged object
21.
3 points
The rate at which charge carriers do work is called
Current
Power
Resistance
Potential Difference
22.
3 points
Which of the following is not an insulator?
A metal door knob
A rubber car tire.
A plastic comb
A wooden block
23.
3 points
If electricity were compared to a water system where a pump was pushing water through a hose, the pump would be the
Capacitance
Current
Potential Difference
Resistance
24.
3 points
(refer to diagram #1 on the separate diagram sheet) Charge q1 has _______ charge of q2.
four times the
the same
three times the
two times the
25.
3 points
A device which converts chemical energy into electrical energy is called a
Battery
Generator
Capacitor
Resistor
26.
3 points
If a test charge is repelled by a negatively charged electric field, the test charge must be
negative
not enough information
positive
neutral
27.
3 points
A device used in circuits to control the direction of current is called a
Capacitor
Conductor
Resistor
Diode
28.
3 points
(refer to diagram #1 on the separate diagram sheet) In the diagram the two charges are
in equilibrium with each other.
grounded
attracting each other
repelling each other
29.
3 points
(refer to diagram #2 on the separate diagram sheet) A positive test charge at point C will
pull both charges towards itself
be repelled away from both charges
remain where it is
move closer to one of the charges
30.
3 points
An electric heater is operated by applying a potential difference of 50.0 volts across a wire of total resistance 8.00 Ohms. The Power rating of the heater (you must use both the Ohm's Law and Electrical Power equations)
434.1 Watts
281.2 Watts
172.4 Watts
312.5 Watts
31.
3 points
A 1050 Watt electric toaster operates on a household circuit of 120 volts. What is the resistance of the wire that makes up the heating element of the toaster? (Use the electrical power equation and Ohm's law)
4.55 Ohms
8.75 Ohms
0.11 Ohms
13.71 Ohms
32.
3 points
The measure of the difference in electrical potential energy between two positions in the space divided by charge is called
capacitance
resistance
current
potential difference
33.
3 points
you bring a charged object near an uncharged object that is not connected to a ground. The positive and negative charges move to opposite sides of the uncharged object. This is an example of
polarization
charging friction
charging by induction
coulomb's law
34.
3 points
In direct current____________
the source of potential difference is constantly changing sign
charges move in one direction with negative charges moving from higher to lower potential
there is no net motion from the charge carriers they simply vibrate back and forth
charges move only in one direction, with negative charges moving from lower to higher potential
35.
3 points
Two conductors transfer the same amount of charge. One conductor is cooled to near freezing while the other conductor remains at room temperature. The charge going through the conductor near freezing will experience ___________ resistance than the shorter conductor
more
not enough information
less
equal
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