Here's what you'll need:
2 "D" cells
3 pieces of aluminum foil cut into strips 6 inches long by 1/4 inch wide
2 standard flashlight bulbs
A roll of cellophane tape
|Here's what to do:|
|Hook up a single battery to a bulb using the aluminum foil strips:|
|1. Tape one strip of foil to the positive (+) end of the battery and a second strip to the negative (-) end of the battery.|
|2. Touch the free end of the positive (+) strip to the metal side of the bulb right below the glass and the free end of the negative (-) strip to the little silver tip at the bottom of the bulb.|
At this point, the bulb should light! Now you're ready for the challenge.
1. What will happen to the brightness of the bulb when you add the second battery to the circuit? Try it yourself! How must the second battery be turned in order to get the bulb to light?
2. What happens to the brightness of the bulb when you add a second bulb to the circuit? Once you've got your results with the two batteries and the single bulb, use the third foil strip to insert the second bulb in the circuit. What happens to the brightness of the bulb now? Why do you think the change occurred? What happens to the bulbs if any of the connections in the circuit break?
Before you try this Science Lab, predict with your classmates what will happen to the brightness of the bulb when you hook up the second battery. Also, make sure you explain HOW the battery must be inserted into the circuit in order to get the bulb to light up. Then, predict what will happen when you add the second bulb to the circuit.When you've finished the Science Lab, share the results with the rest of your class. Make sure you explain how you got these results. Be sure to answer the challenge questions!