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Electricity

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Shawn Liner

on 16 July 2013

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Transcript of Electricity

Resistance
Resistance
Electricity
Electrons Charge is -1.6e-19C
Protons is the same, just positive
What is it?
Collection or flow of electric charge
Coulombs Law
Charge
Voltage
Usually an excess or lack of electrons
Charges attract or repel
Like charges repel
Opposite Charges attract
F= Force between particles (Newtons)
qa = charge of particle a (Coulombs)
qb = charge of particle b (Coulombs)
d = distance between particles (m)
K = 9E9Nm2/C2
Charge is measured in Coulombs
Voltage is the potential energy of Electicity.
We usually think of it as the "push" of electricity
Just like when a ball falls in gravity, its
potential energy decreases---
When a charge falls towards an opposite charge, it's potential energy decreases
Another way to think of voltage
is the pressure in a pipe.
Static Electricity
"Static" meaning "not moving"
Electric Flow
When the "Pull" moves electrons.
Current
Unit: Ampere
a measure of charge(electron)flow
Current
Q=charge (C)
t = time(s)
Example
Unit: ohm
a measure of opposition to flow.
R=
V
I
Volts
Current
Two Types of Current
DC = Direct Current
AC = Alternating Current
Power
Rate of Work
P=IV
Power
Current
Voltage
Example Problem 1
A 1050W electric toaster operates on 120V.
What is the resistance of the toaster?
Example Problem 2
A 120V Electric Heater uses a 20ohm
resistor element. Find the Power of the Heater.
Hint
V=IR
Prediction
Full transcript