10-9-14 Power and Potential

This is a drawing of a circuit. These ancient pieces of art reflect early understandings of parallel and series circuits. It includes how to draw a switch in the lower corner as well as a bulb, a resistor, and a power supply. Truly the people who drew these were wise beyond their years.

This circuit is running power through a coil and then into a current sensor using logger pro to collect data. the coil can then be used to heat up water in a cup and the transfer of heat between the coil and the water will be an added amount of resistance with is relative to the temperature of the water.

Because of the water, the slope of the graph is not ohmic. Therefor the constant is no that of resistance and the equation ust be looked at differently.

This equation is more specific for the relationship between the change in temperature and the resistance.
Alternate forms of Joule's Law for Ohmic Materials: V = I R

P=VI=V^2/R=I^2R

• Like gravity the electric force is a conservative force. Therefore it should be possible to talk about an electrical potential energy in the same way we talk about a gravitational potential energy. This is not surprising because of the similarity between symbolic structure of the gravitational force and the electrical force. 

This is the conversion of potential energy due to a difference in location of particle charges.

This is the connection between work and voltage. It takes positive external work to move a positive charge into a reion of higher voltage. In this case, you are doing external work against the electrc force field. Force fields are real. Likewise, it takes positive external work to move a negative charge into a region of lower voltage.
Work is path independent. the work to go from point A to point B is the same no matter which path is taken to go from A to B.