Projects: UDL : UDL Electricity - build a light circuit (3-4)
This page last changed on Oct 11, 2007 by ehazzard.
How do you use electricity to light up a bulb?
Build a circuit to light a bulb with a battery.
Electric current is created when electric charges move along a wire. This electric current is very useful because it can move energy from one place to another and do many valuable tasks.
Think of an example in your house for each of these tasks:
Batteries push electric charges through a circuit. They store electrical energy, and the current carries that energy to such things as lights, heaters, and motors.
Every battery has a positive end and a negative end. At the positive end there are extra positive electric charges, and at the negative end there are extra negative charges. Look at your battery and identify the positive and the negative ends. How do they look different? How can you tell them apart?
To work, electric devices need a circuit, which is a loop that allows the current to flow in a continuous circle.
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Experiment with the holiday bulb, the wires, and the battery to make a circuit that lights up the bulb. If you have trouble, click on the for suggestions.
Draw a picture of your circuit.
When your drawing is complete, draw a red line in a loop to show the path of your circuit.
Draw a picture of how you can use your circuit to test whether a material allows electric current to flow.
Explain why electrical devices such as lights and appliances need two wires, not just one.
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