Circuits
The name of a circuit that does not let electrical current flow
Open circuit
True or False: Adding more coils to an electromagnet will make it stronger.
True
What is the name of an item that allows electricity to flow through it?
Conductor
What is the name of the prediction a scientist makes before conducting an experiment?
Hypothesis
What are renewable energy resources?
A resource that can be naturally replaced in a short amount of time.
The name of a circuit that allows for electrical current to flow
Closed circuit
What is created when an electrical current runs through a wire wrapped around an iron nail?
A magnetic field/an electromagnet
What is the name of an item that does not allow electricity to easily flow through it?
Insulator
True or False: A scientist changes the dependent variable in an experiment.
False! Independent variable is what a scientist purposely changes
What kind of energy is released in the form of light?
Radiant energy
The materials needed to build a simple circuit
Dry cell (battery), wires, and a lightbulb
Name two ways an electromagnet can be made stronger
1) Increase the number of wire coils
2) Add more dry cells (batteries)
Fill in the blank:
All __________ conduct electricity.
metals
What do the number of batteries represent in the experiment below?
Jose wanted to test the effect of adding more dry cells to an electromagnet.
Independent Variable
What is the particle responsible for producing electrical energy?
electrons
Toby is building a circuit. When he lowers the switch, the lightbulb does not light up. Why might the circuit not work?
Possible answers:
-a wire is not fully connected
-the dry cell is dead
-the lightbulb is burnt out
Kunal tried to build an electromagnet using a long wire, dry cell, and aluminum nail. Why did the electromagnet not work?
The nail was made out of aluminum, not iron
Name three examples of insulating materials.
rubber, plastic, wood, glass, cardboard
Why is it important to only have one independent variable in an experiment?
What is an energy transformation that occurs when using an electric oven?
Electrical energy --> Thermal energy (heat)
Name TWO things a scientist could do to make the lightbulbs in a circuit brighter.
1) Add more dry cells
2) Remove lightbulbs
Name three places where electromagnets are used in the real world.
Metal scrapyard claw machine, MRI scanners, and maglev trains
Explain why wires and electrical cords are wrapped in a plastic coating.
What is the dependent variable in this experiment?
Joanna wanted to test the strength of an electromagnet. She coiled a wire around an iron nail 15, 25, and 35 times. Joanna recorded how many paperclips the electromagnet picked up each time.
The number of paperclips attracted
What are three examples of fossil fuels?
Coal, petroleum (oil), and natural gas