Electricity Test

Master electricity! Static vs. current, circuits & more.

1.Which statement would be correctly classified and why? Lightning strikes a building does not belong on either chart. Charging a cell phone and clothes sticking together in a dryer belongs on the static side because both are temporary. Negative charges moving through a wire and charging a cell phone belong under current because they do not naturally occur and are created by humans. A buildup of electrical charges on an object, clothes sticking together in a dryer belong under current because they have charges that move around. 2. A student turns on a computer to do homework. He then walks across the carpet and touches the metal chair to see a flash of light and feel a shock. Which statement is the best explanation of what was observed? Both actions are examples of electricity. The computer is powered by current electricity and the shock is caused by static electricity. The computer is the only example of electricity. It is plugged into the wall and is powered by current electricity. The shock is caused by static forces and it is not plugged into the wall so it could not be electricity. The shock and flash of light was caused by current electricity from the computer. There is no static electricity in the room. 3. A student walks around his house in an effort to find examples of static electricity. Which of the following examples BEST explains an example of static electricity that might be found around the student’s home? The toaster is an example of static electricity because it is plugged into an outlet. Outlets are an example of static electricity because static electricity is human-harnessed. The spark created when his sister walks across the carpet and then touches the door is an example of static electricity. This is static electricity because it is naturally occurring. The fresh charge on his mom’s cell phone is an example of static electricity. This is static electricity because it is naturally occurring. The laundry that is clinging together after the dryer is turned off is an example of static electricity. The clinging laundry is an example of static electricity because static electricity is human-harnessed. 4. Use the images below to answer the following question:Which of the following explanations best describes the electricity found in the images? Image 1 is the only example of human-harnessed energy because a human had to create the circuit that runs the stop light. Images 1 and 2 are both examples of naturally-occurring electricity, and image 3 is an example of human-harnessed electricity. This is because the electrons in image 3 are more unpredictable than in images 1 and 2. All of the images are examples of human-harnessed electricity because images 1 and 2 were created by humans to improve life, and scientists regularly use energy taken from lightning to provide power for power plants. Images 1 and 2 are examples of human-harnessed electricity, and image 3 is an example of naturally-occurring electricity. This is because images 1 and 2 humans control the flow of negative charges. Image 3 naturally occurs when there is an imbalance of charges in the clouds. 5. A student documented different examples of electricity found outside.The student claims that all three examples are naturally occurring electricity. Which of the following arguments BEST explains why the student’s claim is correct or incorrect? The student’s claim is correct; all three examples show naturally occurring examples because the flow of electrons are uncontrolled. The student’s claim is correct; all three examples show naturally occurring examples such as wind, sun, and lightning, which all produce electricity. The student’s claim is incorrect; example 1 and 2 show human harnessed electricity since humans have created tools to control electricity using the sun and wind. 6. Identify the picture below as a series circuit or parallel circuit. Series Circuit Parallel Circuit Do not mark this choice 8. A student learns about simple circuits at school and would like to show his parents how they work. Which of the following components should he use to construct his model? Wire, lightbulb, and switch Wire, lightbulb and battery Wire, battery, and switch Lightbulb, battery, and switch 9. A student observes the model of a simple circuit with a switch. He notices the light bulb is not lit. What conclusion can the student make? The circuit should work since the switch is on, so there must be a gap in the connection of the wires causing the circuit to be open. The switch is in the open position not allowing the electrical current to flow, causing the light bulb to not be lit. The switch is in the open position allowing the electrical current to flow, causing the light bulb to not be lit. Either the light bulb is burned out or the battery needs to be replaced. 10. A student makes a chart of materials they will use to create a simple circuit. The student also writes the purpose of those materials in the circuit.Students in the class look at the list and provide revisions to the chart. Which student makes the correct revision? Student A: The purpose for the lightbulb is to conduct electricity, not power the circuit. Student B: The purpose for the wire is to turn the circuit on and off, not to conduct electricity. Student C: The purpose for the switch is to power the circuit, not to turn the circuit on and off. 11. A student drew a plan that they will use to build a simple circuit.Using data from the plan, what will the student conclude when they build the circuit? The light bulbs will light up since it has a wire, battery, and two lightbulbs. The light bulbs will light up since it is a closed circuit. The light bulbs will not light up since it is missing a switch. The light bulbs will not light up since it is an open circuit. 12. A student has constructed the electric circuit pictured below. The circuit will be used to light up the backdrop of a project. The students in the group began to analyze the circuit.Which statement describes what the group should do next? Place the light into the backdrop and close the circuit by pushing the paper clip switch down. It will then light up the bulb. The battery and bulb will need to be replaced because the bulb will not light up. Once that is done the circuit will light up the back drop. First, the paper clip switch should be closed. Then, the circuit needs to be rewired because the electricity will need to pass through the light bulb in order for it to light the backdrop. The gap between the wires should be closed and the battery should be moved to the other side of the bulb. The bulb will light up and can be used in the backdrop. 13. A student is problem solving why a classmate’s electrical circuit project is not lighting a bulb. They both notice that there is a gap in the wiring but there is not enough wire to complete the circuit. What could the students do to fix the problem? Place an eraser in the space Change the light bulb or battery Use a piece of string instead of the wire Place a paperclip between the wires in the gap 14. A teacher gave the class the following list of items and asked the class to determine if the item is an insulator or a conductor of electricity.How could the students prove their answers through an investigation? Put the objects in the sun. If the item becomes hot, it is a conductor of electricity and if the item is the same temperature then it is an insulator. If the item is hard and shiny it’s a conductor, if the item is soft or flexible it is an insulator. Touch each object with a battery to see if it will produce a spark, if it does then it is a conductor, if it does not then it is an insulator. Create a circuit with a lightbulb and then replace one of the wires with the item. If the lightbulb turns on, then it is a conductor if the bulb does not light it is an insulator 15. A piece of toast is stuck in an electric toaster. Four groups of students are constructing devices to remove the toast safely without getting shocked.Which group of materials will solve the problem safely and why? Group 1 because the materials can easily be used to create a circuit and the forks could stab the bread Group 2 because the materials would not complete a circuit, they would stop the flow of energy and the chopsticks could reach into small places. Group 3 because the foil will stop the heat from traveling and the electricity and the string could wrap around the bread. Group 4 the wire could complete a circuit and the tweezers could pinch the bread. 16. A student found unidentified items around the classroom. The student tests out the items in a circuit. The results are below.Based upon the data, what can the student conclude about the mystery items? Mystery Items #2 and #3 can be used as a conductor and a switch to turn on and off the circuit. Mystery Items #1, #3, and #4 are conductors since the lightbulb turned on. Mystery Items #1 and #4 are conductors since the lightbulb turned on. Mystery Items #1 and #4 are insulators since the lightbulb turned on. 17. Students construct a simple circuit and place an item in the gap. Which of the following materials will conduct electricity? Paperclip, nail, and penny Paperclip, nail, and cardboard Rubberband, paperclip, and nail Rubberband, eraser, and cotton ball 18. A student collected materials and wants to figure out which group are insulators and which group are conductors.A student would like to determine which of the materials in the boxes above would make a good switch to use in his circuit below.How would he test each of the materials to determine if they were a good conductor or insulator? Describe the way a student should test the materials and tell what would make a good switch. The student would need to take out the battery and replace it from the material. If the lightbulb turns on, then electricity flows meaning it is a conductor. If the lightbulb does not turn on, then electricity does not flow meaning it is an insulator. The student would need to take out the battery and replace it from the material. If the lightbulb turns on, then electricity flows meaning it is an insulator. If the lightbulb does not turn on, then electricity does not flow meaning it is a conductor. The student would place each material in the gap between the two wires. If the lightbulb turns on, then electricity flows meaning it is a conductor. If the lightbulb does not turn on, then electricity does not flow meaning it is an insulator. The student would place each material in the gap between the two wires. If the lightbulb turns on, then electricity flows meaning it is an insulator. If the lightbulb does not turn on, then electricity does not flow meaning it is a conductor. 19. The shock you sometimes feel when you touch a metal doorknob on a dry day is electric circuit current discharge resistance 20. Which of the following is made of a material that BEST conducts electric current? paper clip rubber ball wooden block drinking glass