Electricity intro

When you scuff your feet on a rug, electric charges move off you by

• static discharge
• friction
• static discharge
• conduction

An example of a voltage source is a(n)

• magnet
• electrical wire
• battery
• a resisitor

In a series circuit  with 4 bulbs:

• a switch is never used
• all of the bulbs become dimmer if another bulb is added
• There are many paths for electricity to take
• the remaining 3 bulbs stay lit if one burns out

An example of an insulator is:

• iron
• silver
• copper wire
• rubber

Electromagnets are often used:

• in compasses
• a device on the end of a crane used to lift scrap metal
• in insulators
• in solar heaters

When static electricity leaves an object we call that:

• discharge
• charging by induction
• charging by conduction
• Frictional charge

What charge does an electron have?

• negative (-)
• positive (+)
• neutral or no charge (0)

Which is NOT an insulator.

• Wool
• Plastic
• Copper
• Glass

A material in which electrons are not able to move easily 

• Circuit 
• Insulator 
• Resistance 
• Conductor

Why are metals useful for making electrical wire?

• Metals do not bend.
• Metals hold much heat.
• Metals are insulators.
• Metals are conductors.