5.12 Unit 5 Quiz

what is any material electricity can flow through?

• insulator

• conductor

• resistor

• magnet

if 2 electrically charged objects repel one another, which statement must be true?

• one object has more electrons, and the other has more protons

• the objects do not have strong electrical fields

• the objects have the same electric charge

• electrons jump for one object to the other when they touch each other

can 2 negatively charged balloons move apart without ever touching? why or why not?

• yes, because electrons from one balloon jump to the other and push it

• yes, because electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them

• no, because objects have to touch to exert forces that attract and repel

what is the best explanation of electric current in a wire?

• protons are pushed along by Jedi forces

• electrons flow because of electrical attraction and repulsion

• atoms move because of heat

• electrons build up in the wire and create a road

why does a light go out when you turn off the wall switch?

• the switch changes the direction of the flow of electrons

• the switch causes a break in the circuit

• the switch changes the circuit from series to parallel

• the switch absorbs the electrical energy

why are electromagnets temporary magnets?

• they are powerful permanent magnets

• they are weak permanent magnets

• they can be turned on and off

• they eventually stop working

which materials are need to make an electromagnet?

• metallic core and magnet

• electrical conductor and power source

• power source, metallic core, and electrical conductor

• metallic core, magnet, and switch

which type of circuit provides only one path for free electrons to flow?

• series

• parallel

• polar

• sprague

what is a machine that converts electrical energy into mechanical energy?

• generator

• motor

• electromagnet

• galvanometer

what are resources that can be used repeatedly and replaced naturally?

• money

• renewable

• stock

• nonrenewable