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#ref #incomplete
1 Voltage
- Units: \(\frac{Nm}{C} = \frac{J/C} = V\)
- Amount of energy per unit of charge it takes to bring that charge to
that point
- If you have a ball and you are taking it up the hill, then it takes energy to do that
- When you let go, it will roll back down the hill
- Voltage = energy per charge is similar to energy per kilogram of raising the ball.
- Field is the amount that it is resisting–the amount of force required to move the charge.
- Analogous to gravitational potential energy.
1.1 Zero Point
- If you have one positive and one negative, then the zero point of the voltage is between the two charges
- The zero can be defined anywhere, just like zero gravitational energy
can be anywhere
- However, conventionally, we define zero to be between two opposite charges
- We also define the voltage infinity distance away to be zero
1.2 Equipotential
- A line that shows where voltage is the same srcPhETChargesFieldsEquipotentialLines.png
- Joules of electric potential energy
- Scalar, while electric field is a vector ### Relationship with Electric Field
- Perpendicular to the electric field
