Current: A flow of electrons, or individual negative charges. Current: A flow of electrons, or individual negative charges. Copyright © 2010 Ryan P. Murphy

The electrons have a mass (however small), and when they move through the conductor, there are collisions that produce heat. Copyright © 2010 Ryan P. Murphy

Don’t over connect outlets because they could short circuit. Copyright © 2010 Ryan P. Murphy

Conductors, Insulators, Semi-conductors: How easily energy is transferred through the object by the moving charge. Conductors, Insulators, Semi-conductors: How easily energy is transferred through the object by the moving charge. Copyright © 2010 Ryan P. Murphy

Conductor – Electrons flow easily, semi flows in the middle. Conductor – Electrons flow easily, semi flows in the middle. Copyright © 2010 Ryan P. Murphy

Semi-conductor: Conductivity between conductor and insulator (electronics use). Semi-conductor: Conductivity between conductor and insulator (electronics use). Copyright © 2010 Ryan P. Murphy

Insulator – Electrons do not flow easily. Insulator – Electrons do not flow easily. Copyright © 2010 Ryan P. Murphy

There are two main kinds of electric current, direct current (DC) and alternating current (AC). There are two main kinds of electric current, direct current (DC) and alternating current (AC). Copyright © 2010 Ryan P. Murphy

There are two main kinds of electric current, direct current (DC) and alternating current (AC). There are two main kinds of electric current, direct current (DC) and alternating current (AC). Copyright © 2010 Ryan P. Murphy Any Guesses about this picture? Any Guesses about this picture?

There are two main kinds of electric current, direct current (DC) and alternating current (AC). There are two main kinds of electric current, direct current (DC) and alternating current (AC). Copyright © 2010 Ryan P. Murphy

(DC) Direct current is a flow of charge always in one direction. (Batteries) (DC) Direct current is a flow of charge always in one direction. (Batteries) Copyright © 2010 Ryan P. Murphy

(AC) -Alternating current is a flow of charge back and forth, changing its direction many times in one second. (Plugs and outlets / household) (AC) -Alternating current is a flow of charge back and forth, changing its direction many times in one second. (Plugs and outlets / household) Copyright © 2010 Ryan P. Murphy

Advantages of AC –Voltage can be raised or lowered –More efficient over long distances Copyright © 2010 Ryan P. Murphy

Advantages of AC –Voltage can be raised or lowered. –More efficient over long distances Copyright © 2010 Ryan P. Murphy

Advantages of AC –Voltage can be raised or lowered. –More efficient over long distances. Copyright © 2010 Ryan P. Murphy

Advantages of AC –Voltage can be raised or lowered. –More efficient over long distances. Copyright © 2010 Ryan P. Murphy

Recommended Soundtrack for the next Activity. – Thunderstruck - Play Now!

“DC”

“Its one way!”

“AC”

“It Alternates!”

Is this (AC) Alternating Current, or (DC) Direct Current?

?

All Done!

Where do you find this strange device? –What does it do?

Where do you find this strange device? –What does it do?

An electric meter or energy meter is a device that measures the amount of electrical energy consumed by a residence, business, or an electrically powered device.

Watt: The amount of electricity consumed per second. Watt: The amount of electricity consumed per second. Copyright © 2010 Ryan P. Murphy

A Watt is calculated by multiplying volts times amps. Most household electrical usage is billed in kilowatt hours, or the amount of hours times 1,000 watts. Copyright © 2010 Ryan P. Murphy

Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment –How many watts does it require?:

Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment –How many watts does it require?: –Watts = Volts x Amps

Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment –How many watts does it require?: –Watts = Volts x Amps –Watts = 120v x 2.5amps

Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment –How many watts does it require?: –Watts = Volts x Amps –Watts = 120v x 2.5amps = 300watts

“Oh No!”

Question? We have an electronic device with a sticker that shows 5 amps. Given a 12 Volt battery power source, How many watts does it require?:

–Watts = Volts x Amps

Question? We have an electronic device with a sticker that shows 5 amps. Given a 12 Volt battery power source, How many watts does it require?: –Watts = Volts x Amps –Watts = 12 volts x 5 amps =

Question? We have an electronic device with a sticker that shows 5 amps. Given a 12 Volt battery power source, How many watts does it require?: –Watts = Volts x Amps –Watts = 12 volts x 5 amps = 60watts

“Oh No!”

“He’s dead, let’s just leave him.” “He’s dead, let’s just leave him.”

Ampere: A measure of how much current moves through a wire in one second. Basically, the larger the size of wire, the greater the ampere capacity. Ampere: A measure of how much current moves through a wire in one second. Basically, the larger the size of wire, the greater the ampere capacity. Copyright © 2010 Ryan P. Murphy

Where do your see these plugs? –Why are they larger? Copyright © 2010 Ryan P. Murphy

Answer: The Plug to a dryer or stove is much thicker than a standard outlet to account for extra amps. Copyright © 2010 Ryan P. Murphy

Answer: The Plug to a dryer or stove is much thicker than a standard outlet to account for extra amps. Copyright © 2010 Ryan P. Murphy

Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance. Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance. Copyright © 2010 Ryan P. Murphy