current, voltage, & resistance
DESCRIPTION
An overview of electric charges, current, voltage, and resistance- with a little bit of Ohm's Law.TRANSCRIPT
Electric Charges & Circuits
Some rights reserved by reutC
Remember: Electric charges come in two varieties.
Negative
Positive &
Opposite charges attract.
Like charges repel.
Like charges repel.
How do we describe electricity?
Voltage The difference in electric potential between 2 points.
How much the electric charges want to move.
or
Some rights reserved by Elfo Tógrafo
High Voltage
Some rights reserved by Elfo Tógrafo
Low Voltage
Some rights reserved by Elfo Tógrafo
Zero Voltage
How do we describe electricity? Voltage
is measured in Volts (V).
Some rights reserved by crows to burnaby
The symbol for Voltage is:
V
How do we describe electricity?
Current How much electricity is flowing
Some rights reserved by Elfo Tógrafo
High Current
Some rights reserved by Elfo Tógrafo
Low Current
The symbol for Current is:
I
Current is measured in Ampères (Amps)
How do we describe electricity?
Resistance How difficult it is for electricity to move through a material.
Low Resistance
High Resistance
Electric fence, via Wikimedia Commons: http://commons.wikimedia.org/wiki/File:XN_Electrical_insulation_Electric_fence_00.jpg
The symbol for
Resistance is:
R
Resistance is measured in Ohms (Ω)
Ohm’s Law
V=IR Watch:
http://www.youtube.com/watch?v=-mHLvtGjum4