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Potential Difference
SWBAT calculate the potential
difference of a charge in a position in
space.
1) 4
2) 2
3) 3
4) 2
5) 1
6) 2
7) 4
8) 4
9) 1
The force felt by a specific object due to it’s
mass and the gravitational field strength.
Fg = mg
Gravitational Field Strength
The force per kg of any object in a specific
position due to a gravitational field.
Fg
g=
m
The potential energy possessed by a specific
object due to it’s mass and position.
GPE = mgh
Gravitational Potential
The potential energy per kg of any object in a
specific position.
GPE
W
Gravitational Potential =
or
m
m
The potential energy possessed by a specific
object due to it’s position and charge.
𝑃𝐸𝑒 = qEd
The potential energy per Coulomb of any object
in a specific position.
𝑃𝐸𝑒
W
Electric Potential =
or
q
q
B
A
+
+
It takes work to move the charge from A to B.
This work equals the change in electric potential energy of the charge.
The electric potential is higher at point B than point A.
A
B
+
+
It takes work to move the charge from A to B.
This work equals the change in electric potential energy of the charge.
The electric potential is higher at point B than point A.
Definition: The stored ability to do work per
coulomb of charge at a specific point in a field.
Unit: Joules/Coulomb (J/C) or Volts (V)
Formula:
W
V=
q
Work
Voltage =
charge
Electric Potential Difference (Voltage)
The difference in Potential Energy per charge.
B
A
+
+
Potential Energy
Work
V=
=
charge
charge
1 Joule (J)
1 Volt V =
1 Coulomb (C)
W
V=
q
It takes 6 Joules of energy
to move 3 Coulombs of
charge from position A to
position B. What is the
potential difference
between these two
points?
B
A
+
+
It takes 3.2x10-18 Joules of
energy to move a proton
from position A to
position B. What is the
potential difference
between these two
points?
A
B
+
+
What direction should the positive test charge
move in order to…
a) Gain electric potential energy
b) Lose electric potential energy
c) Keep the same potential energy
+q0
The Voltage of a standard
household electrical outlet
in the US is 120V.
If 5C of charge moves from
one wire of the outlet to
the other, how much
energy is released?