1. Electrical Energy and Current

2. …And the Commonalities between Gravity and Electric Fields CONTINUE!!
Reference point
Reference point
Electrical Potential Energy
Potential energy associated with a charge due to its position in an electric field

3. Electrical Potential Energy
PE = -qEd
PE = Electric Potential Energy (J)
q = charge (C)
E = Electric Field Strength (N/C)
D = distance from reference point

4. Notice the Similarities…

5. Potential Difference V = PE/q PE = Electric Potential Energy (J)
When a force pushes something over a distance….
WORK IS DONE!
Electric Potential – the work that must be performed against electric forces to move a charge from a reference point to the point in question divided by the charge
V = PE/q
V = Electric Potential (V)
PE = Electric Potential Energy (J)
q = charge (C)

6. Potential Difference (ΔV):
Since PE is arbitrary (we can choose where we want to start), a better measurement to use is
potential difference
“The difference in Electric Potential between
two points in an Electric Field”
Potential Difference (ΔV):
5 V - 2 V = 3 V
2 V
Reference point
5 V

7. Potential Difference ohhhh the possibilities…
ΔV = -Ed
ΔV = -ΔPE/q
ΔV = Potential Difference (V)
Δ PE = Change in Electric Potential Energy (J)
q = charge (C)
ΔV = Potential Difference (V)
E = Electric Field Strength (N/C)
d = displacement (m)
ΔV = kq / r
ΔV = Potential Difference (V)
k = coulomb’s constant
q = charge (C)
r = distance to point charge (m)

8. Kinematics (1st Semester)
Electricity (2nd Semester)
Gravitational Field (g)
g = F/m (m/s2)
Electrical Field (E)
E = F/q (N/C)
Law of Gravitation
F = G m1 m2 / r2
Coulomb’s Law
F = K q1 q2 / r2