Build an electrical circuit experiment tips
The experiment appears in the section Learn About Energy.
Materials. Students will need the materials listed on their activity sheet:
|•A printed copy of this activity
|•A pencil to write your answers
|•2 pieces of insulated wire with
1 inch stripped on each end
|•A 1.2-volt light bulb
with matching base
Students will build a circuit and gain an understanding that in order for electricity to travel where we
need it, there must be a complete circuit of electricity. Students should realize that a complete circuit
is like a circle. Students will learn that electricity is produced at one place, travels around the circuit,
and returns to the starting place.
•Students should be supervised by an adult while doing this experiment.
•A teacher or another adult should be responsible for stripping insulation.
•Explain to students that electricity can be dangerous if it is not handled correctly, and emphasize
that they should never experiment with the electricity that comes from a wall outlet. It’s much
more powerful than the electricity made by small batteries and could seriously injure or even kill
Teachers should strip the wires ahead of time and make sure the batteries are fresh. Use tape to stick
the wires to the ends of the battery.
Getting It Across
Have students read the information and follow the steps on the page. Make sure they are able to
identify the circuit electricity travels from the battery to the light bulb and back, and the circuit
electricity travels from power plants to homes and back. They should be able to equate the wires
in the experiment with power lines and electrical wiring in the electric distribution system.
Questions and Answers
1. Ask students to discuss their predictions for what would happen when adding 10 or more light bulbs
to the circuit. (Answers will vary.)
2. What adjustments would you have to make to be sure that all the bulbs would light up? (You
would have to add more batteries.)