Electric Circuits and Currents
Non-Touching Forces
You should know this by now
KE and PE
100
A student is connecting their lightbulb and battery system to a popsicle stick. The student has formed this system in a loop, but the lightbulb is not turning on. Why not?
The popsicle stick is not a good conductor for electricity.
100
List one variable affecting the strength of magnetic forces.
Size of magnet, Strength of magnet, How close the magnet is to the object, Whether there is anything between the magnet and the other object
100
Does food have energy? Why?
Yes, even though it is not moving, it has the ability to make something move or change.
100
A student eats breakfast. After, she runs while listening to music from her phone. Her phone dies. What type of energy does she have the most of when she is running?
She has KE because she is moving.
200
What do the arrows represent in this system?
Electric current
200
Which of the following statements about the strength of non-touching forces and distances between objects is true?
A) Distance does not affect the strength of non-touching forces.
B) Non-touching forces have the same strength from all distances.
C) The strength of non-touching forces decreases as the distance between the objects decreases.
D) The strength of non-touching forces increases as the distance between the objects decreases.
d. The strength of non-touching forces increases as the distance between the objects decreases.
200
Cats run away from me. What kind of energy do they have and why?
Kinetic energy because they are moving.
200
You walk to school. What type of energy do you have and how do you know?
KE because you are moving.
300
________ energy in the battery is converted to ________ energy and transferred by the ________. It then converts to ________ energy when it reaches the lightbulb.
a. potential….electrical….current….light
b. potential….electrical….circuit….light
c. potential….light….current….electrical
d. kinetic….light….current….electrical
a. potential….electrical….current….light
300
The following non-touching forces have both the forces can attract and repel:
a. Magnetic force only
b. Magnetic and Electrostatic force
c. Magnetic, Electrostatic, and Gravitational force
d. Gravitational force only
b. Magnetic and Electrostatic force
300
Does anything create its own energy?
No. Nothing creates energy, it is always transferred from something else that has energy.
300
You wake up in the morning and eat a bagel. What type of energy does the bagel have and how do you know?
It has PE because it is storing energy.
400
Fill in the blanks with the correct multiple choice answer.
An electric ________ is the way that electrical energy is transferred from one place to another, and an electric ________ is a closed path in which an electric ________ can exist.
a. circuit….current….circuit
b. current….circuit….current
c. current….current….circuit
d. circuit...circuit...current
b. current….circuit….current
400
Which of the following statements is true?
A) Magnetic force occurs between a magnet and other magnets or objects made of certain metals, electrostatic force occurs between objects with an electric charge, and the force of gravity occurs between all objects, we just do not always see the effects of the gravitational force.
B) Magnetic force occurs between a magnet and other magnets or objects made of certain metals, electrostatic force occurs between objects with an electric charge, and the force of gravity only occurs from large objects.
C) Magnetic force occurs between a objects with an electric charge, electrostatic force occurs between a magnet and other magnets or objects made of certain metals, and the force of gravity occurs between all objects, we just do not always see the effects of the gravitational force.
D) Magnetic force occurs between objects with an electric charge, electrostatic force occurs between a magnet and other magnets or objects made of certain metals, and the force of gravity only occurs from large objects.
A) Magnetic force occurs between a magnet and other magnets or objects made of certain metals, electrostatic force occurs between objects with an electric charge, and the force of gravity occurs between all objects, we just do not always see the effects of the gravitational force.
400
What is the main difference between kinetic and potential energy?
Kinetic energy is the energy that objects have when they are moving, and potential energy is the energy that objects have when they are storing energy.
400
Which are the best examples of objects that ALL have potential energy?
A) a lightbulb shining, the sun
B) a moving car, a child skating on ice
C) a battery, a stretched rubber band, food
D) a bird flying, a soccer ball flying through the air
C) a battery, a stretched rubber band, food
A battery has chemical PE, a stretched rubber band has elastic PE, and food has chemical PE, all forms of stored energy.
500
Draw a quick sketch of how wires would need to be connected to make the lightbulb turn on using the following items:
The sketch should include all three items connected in a loop.
A working circuit required a closed loop system.
500
The picture below displays a model of Earth’s gravitational fields. Which of the following sentences about Earth’s gravitational field is true?
A) There are lines and arrows around the earth, and if we look in space we can see them.
B) This picture shows that gravitational force is stronger as you get closer to Earth.
C) This picture shows that gravitational force is weaker as you get closer to Earth.
D) The picture shows the direction of magnetic force.
B) This picture shows that gravitational force is stronger as you get closer to Earth.
500
Describe energy transfer starting with the sun and ending with a human and a hand crank generator. Make sure to include some chickens too.
Energy is provided by the sun, which transfers energy to plants, which provides energy to chickens, which provide energy to humans, who use kinetic energy when turning the hand crank.
500
A student eats breakfast. After, she runs while listening to music from her phone. Her phone dies. What type of energy does her phone have?
Her phone has potential energy because it is still storing energy, and has the potential to turn back on.