science test pg.2

Good conductors are

metal
Poor conductors are

cotton, wood and plastic
A device that controls the current in a circuit

switch
what does a dry cell produce

direct current
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

genarator

Author

julia1

204664

Card Set

science test pg.2

Description

science test pg 2 march 11

Updated

2013-03-03T21:23:56Z

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