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WorksheetsQuiz 5 - Electric Current and Circuits
Total questions: 96
Worksheet time: 3hrs 12mins
The power of a toaster can be determined if which of the following values are known?
the dimensions of the toaster
the resistance of the toaster's insulation
the voltage applied to the toaster and the toaster's temperature
the current through the circuit and the voltage applied to the toaster
The measurements in the table below are from four circuits that have the same components except for the battery. Which of the following statements describes how voltage, current, and resistance are related by Ohm’s law in these circuits?
As voltage increases, current decreases and resistance decreases.
As voltage increases, current increases and resistance stays the same.
As voltage increases, current decreases and resistance stays the same.
As voltage increases, current stays the same and resistance decreases.
The diagram below shows an electrical circuit. Which of the following best explains why energy stored in the battery power source diminishes over time when this circuit is complete?
The power source generates energy more slowly than the light bulb consumes it.
The light bulb converts the negative charge of electrons into light and heat.
The light bulb transforms energy into light and heat.
Energy is destroyed when the light bulb operates.
The distance between two charges is represented by d. In which of the following diagrams is the attractive force between the two charges the greatest?
Diagram A
Diagram B
Diagram C
Diagram D
Which of the following conditions results in the buildup of static charge on an object?
when neutrons outnumber electrons
when there are more protons than neutrons
when there are more electrons than protons
when all neutrons have been removed from the object
A copper sphere, a glass sphere, a plastic sphere, and a rubber sphere are placed on individual insulating stands. A student touches each sphere with an electrically charged object. The sphere made of which material will distribute the electric charge fastest over its entire surface area?
glass
copper
plastic
rubber
The graph below relates the current to voltage data for a resistor. Which of the following is the value of the resistor?
0.2 Ω
2.0 Ω
4.0 Ω
10.0 Ω
The two resistors shown below are connected to identical power sources. Resistor 1 has a resistance of 30 Ω, and resistor 2 has a resistance of 45 Ω. The current in resistor 1 is 2 A. What is the current in resistor 2?
A. 1.0 A
B. 1.3 A
C. 1.5 A
D. 3.0 A
What is the voltage across the terminals of a 23 Ω resistor that has 0.065 A of current flowing through it?
A. 0.0028 V
B. 0.097 V
C. 1.5 V
D. 350 V
The diagram below shows a simple electric circuit. Which of the following statements describes the function of the battery?
It reduces the flow of electrons.
It transmits light through the circuit.
It pushes electrons through the circuit.
It releases light during a chemical reaction.
The diagram below shows copper wire wrapped around a cardboard tube, which is then attached to a galvanometer. A galvanometer detects and measures small amounts of electric current. Which of the following would cause the galvanometer needle to move?
wrapping additional wire around the tube
uncoiling the wire wrapped around the tube
moving a magnet back and forth inside the tube
moving an aluminum block up and down inside the tube
Which of the following actions would increase the current through a circuit component?
placing another identical component in series in the circuit
increasing the voltage across the component
increasing the resistance of the component
decreasing the power in the component
A microwave oven uses 10 A of current when connected to a wall outlet that provides 120 V of electricity. What is the resistance of the microwave oven?
0.083 Ω
12 Ω
110 Ω
1200 Ω
Which of the following is not true for both gravitational and electric forces?
Forces are either attractive or repulsive.
The inverse square distance law applies.
Forces are proportional to physical properties.
Potential energy is a function of distance of separation.
Describe what happened when electrons move through a metal conductor.
the temperature of the conductor decreases.
they move at the speed of light in a vacuum.
they move in a straight line through the conductor.
they move in zigzag patterns because of repeated collisions with the vibrating metal atoms.
A current of 2 A passes through two resistors placed in series. The first resistor has a resistance of 10 Ω and the second resistor has a resistance of 20 Ω. What is the total potential difference across the two resistors?
13 V
15 V
30 V
60 V
Which component in the diagram converts chemical energy into electrical energy?
component W
component X
component Y
component Z
Large amounts of current can damage a circuit. Which of the following changes in a series circuit will result in an increase in current?
The voltage is halved and the resistance is halved.
The voltage is halved and the resistance is doubled.
The voltage is doubled and the resistance is halved.
The voltage is doubled and the resistance is doubled.
A balloon is rubbed against a sweater. Which of the following occurs because of the rubbing?
destruction of charged particles on the balloon
release of charged particles from the air in the balloon
movement of positively charged particles from one material to the other
movement of negatively charged particles from one material to the other
An electrostatic paint sprayer is used to spray paint evenly onto the surface of a car. Before the paint is sprayed, the car body is given a positive charge and the paint droplets are given a negative charge. The paint droplets experience an attractive force as soon as they are released from the sprayer. The paint droplets are originally sprayed at a distance of 30 cm from the car body. Which of the following changes will cause the largest increase in the attractive force on the paint droplets?
The charge on the car body is doubled.
The charge on the paint droplets is doubled.
The distance between the paint droplets and the car body is halved.
The distance between the paint droplets and the car body is doubled.
Which of the following would be an advantage of using a 42 V battery in a car instead of a 12 V battery?
It would allow carmakers to use fewer circuits.
It would eliminate the use of generators and alternators.
It would produce the same amount of power using less current.
It would produce the same amount of power using more current.
Several groups of researchers were conducting experiments to try to discover whether exercise would lower cholesterol levels. One group had college students run two miles a day for six weeks. Another group had senior citizens participate in gentle water aerobics twice a week for a year. Cholesterol levels dropped slightly among the college students but dropped significantly among the senior citizens. Based on these results, what would be the best thing for the researchers to do next if they desire to validate the findings?
Determine that exercise is more useful in lowering cholesterol levels in older people than in young adults
Conclude that moderate exercise is more beneficial at lowering cholesterol levels than more intensive exercise
Design more studies testing the effect of duration and intensity of exercise on cholesterol levels in different age groups.
Repeat the experiment on college students using different groups of students until the results show a drop in cholesterol levels
The Citicorp building in Manhattan is unique. The engineer designing the building has not accounted for 45 mph (miles per hours) winds because the city code did not require him to. An educated citizen called the engineer after the building was opened indicating that the building was unstable and would collapse in a 45 mph wind. What should the engineer do?
inform the Citicorp building owner
design plan to strengthen the building
run in and tell the people in the building to get out
have the city to condemn the building and tear it down
A student draws a diagram that describes how she thinks people see in the dark. Based on her drawing, she predicts that if people stay in a totally dark room for a long time, eventually their eyes will adjust to the darkness and they will be able to see. When she tries this experiment in a totally dark room, it turns out that her prediction was incorrect, and that she is unable to adjust to the darkness. What should she do with her drawing?
Because her drawing was not useful in making an accurate prediction, she should discard it and not use drawings anymore to make predictions.
Because her drawing represents how she thinks the world works, she should not change it but should be confident that she can use it to make accurate predictions.
Because her drawing represents how she thinks the world works, she should use it to make other predictions and keep checking them until one of them turns out to be correct.
Because her drawing does not accurately represent what really happens, she should make a new version of it that better predicts what she actually experienced in the dark room.
Scientists share the results of their experiments with other scientists and expect them to try to find flaws in their data and experimental design. What is the purpose of doing this?
It makes it possible to award grant money for the best research projects.
It helps scientists to improve their experiments and interpret their data accurately.
It provides an easy way to find out which scientists are good at designing experiments.
It allows scientists to see what others are doing so they do not repeat their experiments.
What is the effect of increasing the resistance in a parallel circuit on the total current?
The total current increases.
The total current decreases.
The total current stays the same.
The total current first increases, then decreases.
In a simple electric circuit, what happens to the brightness of a bulb if the voltage across it is doubled?
The brightness remains unchanged.
The brightness decreases.
The brightness doubles.
The brightness quadruples.
Which of the following materials would most likely be used as an insulator in an electric circuit?
Copper
Aluminum
Rubber
Iron
Which of the following represents the opposition presented to the current by a material or device, measured in ohms?
current
resistance
voltage
electricity
Which of the following represents the rate of the flow of electricity, expressed in unit of amps?
current
circuit
voltage
resistance
Which of the following represents the potential difference between two points, measured in volts?
voltage
current
electricity
resistance
In the model, what do the arrows represent?
The flow of current
The flow of resistance
The flow of voltage
The flow of positrons
In the model, what does the lightbulb represent?
electricity
current
voltage
resistance
In the model, what does the battery represent?
voltage
current
circuit
resistance
Based on this model, what change should be made in order to increase the current?
Close the switch
Add another battery
Add another lamp
Remove a wire
What is the formula for voltage?
V = (I x R) / 2
V = I / R
V = R / I
V = I x R
What is the formula for current?
I = V / R
I = R / V
I = V x R
I = (V x R) / 2
What is the formula for resistance?
R = I / V
R = V / I
R = V x I
R = (V x I) / 2
If a charger for a tablet offers a voltage of 120V and has 240Ω of resistance, what is the amperage?
0.5A
2A
14,400A
28,800A
If an electric ceramic brush has a current of 0.3 amps and a voltage of 120 volts, what is the resistance?
18Ω
36Ω
200Ω
400Ω
If a computer has 10.0A of current and 11Ω of resistance, what is its voltage?
0.9V
1.1V
55V
110V
Without considering the LED light, what would the current be in this schematic?
0.01A
73.3A
220A
660A
Based on the graph, which of the following would be true regarding the relationship of voltage and current?
As voltage increases, current decreases.
Voltage will not affect current.
As voltage decreases, current increases.
As voltage increases, current also increases.
Based on the table, which of the following is true regarding the relationship of voltage, resistance and current?
If resistance remains constant while voltage increases, current will decrease.
If current remains constant while resistance increases, voltage will increase.
If voltage remains constant while resistance increases, current will decrease.
If resistance remains constant while current is increasing, voltage will decrease.
If a circuit had 4 D-Cell batteries (each 1.5 V) and a lightbulb with resistance of 2 ohms, what is the current that flows through the circuit?
2 A
3 A
6 A
8 A
What is voltage?
the amount of push the electrical source supplies to the circuit
how much a given device resists the flow of electric current
flow of electric charge
none of the above
What is current?
the amount of push the electrical source supplies to the circuit
how much a given device resists the flow of electric current
flow of electric charge
none of the above
What is the Total Resistance in this circuit?
3 ohms
30 ohms
30 amps
90 volts
The voltages in the parallel section of a series-parallel circuit ?
a. are affected by the circuit equivalent resistance
b. are difficult to determine
c. are the same across the parallel components
d. decrease through the circuit from component to component
This is an example of a _______ circuit
open
series
parallel
switch
What stays the same throughout this whole circuit?
Resistance
Voltage
Parallel
Current
If the resistance in a circuit increases, the current will
Increase
Decrease
Its stays the same
Not eneough information
What is current?
the amount of push the electrical source supplies to the circuit
how much a given device resists the flow of electric current
flow of electric charge
none of the above
What is resistance?
the amount of push the electrical source supplies to the circuit
how much a given device resists the flow of electric current
flow of electric charge
none of the above
What is the total resistance of this circuit?
0.012 Ω
85.9 Ω
400 Ω
150 Ω
What is the total resistance of this circuit?
0.18 Ω
5.45 Ω
60 Ω
6000 Ω
What is the total resistance of this circuit?
0.068 Ω
14.6 Ω
400 Ω
200 Ω
What is the total resistance of this circuit?
200 Ω
100 Ω
0.063 Ω
15.8 Ω
What is the total resistance of this circuit?
100 Ω
200 Ω
0.063 Ω
15.8 Ω
What is the total resistance of this circuit?
25 Ω
75 Ω
100 Ω
18.75 Ω
What is the total resistance of this circuit?
100 Ω
1.09 Ω
22.44 Ω
33 Ω
What is the total resistance of this circuit?
42.1 Ω
2.55 Ω
0.39 Ω
52.9 Ω
What is the total resistance in this circuit?
364 ohms
169 ohms
1300 ohms
2157 ohms
What is the total resistance in this circuit?
18 ohms
9.0 ohms
4.2 ohms
6.6 ohms
What is the total resistance in this circuit?
5.5 ohms
2.0 ohms
0.82 ohms
7.3 ohms
What is the total resistance in this circuit?
15 ohms
3.6 ohms
1.5 ohms
36 ohms
What is the total resistance in this circuit?
15 ohms
9.0 ohms
45 ohms
8.8 ohms
What is the total resistance in this circuit?
22 ohms
12.7 ohms
3.2 ohms
19 ohms
What is the total resistance in this circuit?
37 ohms
11 ohms
6.3 ohms
5.7 ohms
What is the total resistance in this circuit?
21.5 ohms
13.2 ohms
9.8 ohms
2.7 ohms
What is the total resistance in this circuit?
2.86 Ohms
32 Ohms
35 Ohms
0.35 Ohms
What is the total resistance in this circuit?
110 Ohms
30 Ohms
10 Ohms
25 Ohms
What is the total resistance in this circuit?
25 Ohms
10 Ohms
100 Ohms
50 Ohms
What is the total resistance in this circuit?
18.6 Ohms
23.2 Ohms
10 Ohms
3.2 Ohms
Calculate the current at the point E
6 A
7 A
8 A
9 A
Calculate the current at the point A
6 A
7 A
8 A
9 A
Calculate the current at the point B
6 A
7 A
8 A
9 A
The current in the resistor X is 2.0 A and the current in the 6.0 Ω resistor is 0.5 A. Calculate the resistance of resistor Y
6.0 Ω
2.0 Ω
4.0 Ω
3.0 Ω
The current in the resistor X is 2.0 A and the current in the 6.0 Ω resistor is 0.5 A. Calculate the current in resistor Y
0.5 A
1.5 A
2.5 A
3.5 A
Two 10 Ω resistors are connected in series, their equivalent resistance is
5 Ω
10 Ω
15 Ω
20 Ω
Three resistances 2 Ω, 3 Ω and 6 Ω are connected in parallel, their
combined resistance is given by
11 Ω
5 Ω
2Ω
1 Ω
Two 10 Ω resistors are connected in parallel, their equivalent resistance is
5 Ω
10 Ω
15 Ω
0.5 Ω
Combined resistance of 5 Ω and 10 Ω are connected in series is equal to
10 Ω
15 Ω
20 Ω
25 Ω
Three resistances 20 Ω, 30 Ω and 60 Ω are connected in parallel, their
combined resistance is given by
110 Ω
50 Ω
20Ω
10 Ω
