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Transcript of Electricity
Electrons Charge is -1.6e-19C
Protons is the same, just positive
What is it?
Collection or flow of electric charge
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" meaning "not moving"
When the "Pull" moves electrons.
a measure of charge(electron)flow
t = time(s)
a measure of opposition to flow.
Two Types of Current
DC = Direct Current
AC = Alternating Current
Rate of Work
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.