science test pg.2
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Good conductors are
Poor conductors are
cotton, wood and plastic
A device that controls the current in a circuit
what does a dry cell produce
What happens in lightening
the negative water particles settle in a cloud near the bottom
What happens when lightning strikes a lightning rod on top of a building?
electrical energy flows through a wire and into the ground
What do similar electrical charges do?
They repel each other
What type of energy does lightning give off?
light, heat, electrical and sound
What are electrical wires often covered with and why?
rubber because rubber is a good insulator
What device produces alternating current? r
What would you like to do?
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