rrent to flow through them are called insulators.
Question: What can be used to bridge the gap between the metal strips and close the electric circuit?
You want the kids to do more than provide a list of conductors. Instead, guide them so they learn to express hypotheses. No, hypotheses are not always needed, but they do encourage kids to pull facts from past experiences in order to make informed predictions.
Remind students that a hypothesis is what they think the answer to the question is. It is not a wild guess, but an idea based on what they already know about the Energy Ball. Give an example hypothesis, such as:
If the human body is a conductor, then a long chain of people might be used to bridge the gap, closing the circuit.
Encourage kids to volunteer hypotheses by giving them clues. Ask, “What other things conduct electricity?” or ” What material could close the gap between the metal strips so electric energy flows?”
You have primed the kids and they should be ready to make you proud with their incredible hypotheses.
Of course, you can always count on at least one student to give an answer received from some space ship. Don’t let this throw you off track. Keep that smile on your face, and applaud such an innovative idea. Explain that you want to test each hypothesis, but at this time you don’t have metal samples from their intergalactic space ship.
Quickly ask a student you can depend on for another hypothesis. With the supplies from your emergency box the hypothesis can be tested on the spot. YEA!! The evaluator will be thrilled that you are so prepared.
Now is the time to really engage the students as well as the evaluator. Test your original hypothesis:
If the human body is a conductor, then a long chain of people should be used to bridge the gap, closing the circuit.
With you and your students holding hands in a circle, break the circle and invite your visitor to join in.
Ask the student next to you to touch one of the terminals on the Energy Ball while you touch the other terminal. There is a gap between you and the visitor.
This is an example of an open circuit. Ask what needs to be done to complete the circuit. The answer will be for you to hold hands with the visitor. But that would be too simple.
Seize the moment. Have some fun and ask if a connection could be made if you touched the visitor’s nose with your finger. Of course it would. But then suggest the visitor touch your nose or your ear. If it doesn’t work, first asks if your little scamps are connected. Kids like to have a bit of fun with the teacher. Also, dry skin can inhibit the flow of electric energy. Moisten your finger with a damp paper towel (of course you have the paper towel and water bottle in your box) before touching the terminal on the ball. The buzzer buzzes and the red light flashes. YEA!!
All lessons need closure. So, let me close by concluding that the list of steps for the scientific method are things that we do naturally when solving problems. In this activity, information about the Energy Ball was collected, questions asked, hypotheses formed, and discoveries about closed and open circuits as well as conductors were made. Yes, The Energy Ball provides opportunities to learn a lot about science. But, one of its most important values is that you and your students can use it to play and have fun with science.
Janice’s Science Challenge
I wonder… How many people can be in the chain used to Turn On the Energy Ball? From now until October 1, 2012, Janice VanCleave and Educational Innovations will hold a contest. The winners will win an autographed copy of Janice VanCleave’s Energy For Every Kid and a $25 gift certificate to Educational Innovations!
Find out specifics for entering Janice’s Science Challenge.
For more information about open and closed electric circuits, see Open and Closed Series Circuits.
If you’re interested, here’s another blog post on the Energy Ball with useful lesson ideas.