We don't have to worry about the possibility that a broken wire will "flood the basement with electricity." Electrical current stays in the wires. But there are electrical equivalents to big pipes and thin tubes.

Main pages in this section	Estimated time required	Link to activities in teacher manual
Conductors and insulators	30 minutes	Electric Circuits #7
Resistors	30 minutes	..
Resistors and capacitors	30 minutes	...
Science content: about resistance	30 minutes
Discussion of resistance	30 minutes

Why study electrical resistance?

Materials needed for this section

• batteries and battery holders *
• wires with clip ends *
• light bulb *
• buzzer *
• light emitting diode *
• various objects and materials to test ("10 objects ... a light bulb, a buzzer, plain water, some very salty or vinegary water, a pencil lead, and yourself (it won't hurt.... much). Include something that you think is a good conductor and something that you think does not conduct at all... ") (you provide)
• resistors *
• capacitor *

Next section:Circuits