(Seem to need a large stick of gun to make this work.)
I.) Electric Potential - work needed or energy acquired when a positive charge is moved from infinity to a certain point in an electric field.
II) Potential Difference (Voltage) potential energy difference between 2 points in an electric field per unit of charge
A) Potential Difference, Energy & Work As a charge moves through an electric field it gains PE or KE
If "Opposites" move Closer
Gain KE or PE?
They Gain KE
'Opposites' Separate Gain KE or PE?
They Gain PE
If "Likes" Separate
Gain KE or PE?
They Gain KE
If 'Likes' move...
closer
Gain KE or PE?
They Gain PE
1) Equation #1
W = work done against field or energy acquired working with field (Joules or eV)
eV = electronVolts (small energy unit)
q
- amount of charge moving through field (Coulombs) V
- Potential Difference (volts)
Ex) It takes 6 Joules of work to move 2 coulombs of charge between 2 points in an electric field. What is the potential energy difference (voltage) between these 2 points?
V = 3 Volts or J/C
2) Potential difference (V) #2
W = work done against field or energy acquired working with field
Electronvolt
q - amount of charge moving through field (# elementary charges)
V - Potential Difference (volts)
Ex) It takes 10 eV to move 2 elementary charges from one point to another in an electric field. Find the potential difference between these points.
V = 5 Volts
Ex) +2 elementary charges acquire 16 joules of energy when they move between 2 points in an electric field. What is the potential difference (voltage) between these two points in the field?
elementary charges, eV Joules/Coulombs
+2 elementary charges= 3.2 x 10-19 C
Calculator Review
V = 5.0 x 1019 Volts
or J/C
W = 4.8 x 10-17 Joule V = ? q = ?
q = 1.6 x 10-19
C
V = 4.8 x 10-17 J / (1.6 x 10-19)C
a) 3.0 x 102 V
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