1. DRAW THE CIRCUIT DIAGRAM YOU USED TO MEASURE THE CURRENT GOING THROUGH A WIRE

2. DESCRIBE THE DIFFERENCE BETWEEN A CONDUCTOR, INSULATOR, AND RESISTOR

3. WHY WAS AN AMMETER USED IN THE LAB ACTIVITY?

4. WHAT IS AN ELECTRICAL CURRENT MADE OF?

Review

OBJECTIVE 5: TYPES OF CURRENT

You should be able to:• Identify (1-3)• Define or Describe (4-7)• Explain or discuss (5-8)

• Alternating current• Direct current• How a battery works

VOCABULARY alternating current

direct current kinetic energy

electrical energy cathode generator

anode Electrolyte

magnet

http://www.youtube.com/watch?v=mozGbPNFf8c (review)http://www.youtube.com/watch?v=JZjMuIHoBeg (circuits)

ALTERNATING CURRENT (AC) electrons jump

back and forth between atoms in the wires

Electrons change direction at over 100 times per second

electrical energy moves forward rapidly – like a wave through the wire

DIRECT CURRENT (DC)

electrons move from one atom to another in a single direction

DIRECT CURRENT (DC) In a battery, electrons move

from negative (−) to positive (+)

Anode - inner part of the battery where electrons are located

Cathode: center of a battery where positively charged ions are located.

electrolyte – pasty mixture between

anode & cathode keeps electrons from

moving thru. Neutralization = empty

battery All of the electrons found a

positively charged ion and made neutral atoms

LAST WORDS AND HMMM http

://www.youtube.com/watch?v=g17f9J1-r-k (ac versus dc)