through long power lines, electrcity gose where it is needed. when switches are turned
on, electricity comes into our circuits. then rooms are lighted, machines are put into
operation, and all kinds of workare dond for us. in today is life and production,
electricity has abecome so usefull that we can not do much without it. however electricity
can be dangerous then or goes where we do not want ot to go.fires may break out from it.
the covering on wires helps keep electricityin the right circuit. if the covering on the
wire is broken, the electricity may go where it is not wanted. some materials are called
good conducgofs beacause electricity goes through them well. but electricity will not
travel through some other materials. wires which carry electricity mist be good conductors,
while the covering on the wires must be made of something through which electricity will
not travel. this covering is called insulation. an electric wire is dangerous if the
insulation is no good. never touch a piece of metal through which electricity may be buning
since most metals are conductors of electricity. never touch a switch when your hands are
wet. never play with electricity. electric motors are machines which change electric power
into mechanical power. they are used in hundreds of ways. electric motors come in many
sizes from the big motors that are used to drive large machines to the very small ones
that run electric fans. what makes electric motors run.