Apr 14 2015

We connect two lights in series, and they the light is very weak.

Keeping the battery constantly, we then connect them in parallel, and they soon light much stronger.

This is the diagram we draw for connecting in series and connecting in parrallel.

We connect a heater to a voltage supply and heat water. We will connect the temperature to graph it, and determine the power of a circuit

This is the initial graph we got. However, it doesn't fix very well, and we will continue the data and fix the graph.

Compared to the graph above, this one is more fixed, and we have a linear function for this graph.

We then draw the diagram for this experiment, and we find the power of the heater. Later, we change some of those value and determine the modified power of this circuit.

This is a work energy question that apply newton's law. We are doing this question is beacuse we want to show that in a electric field, the work done by eletric force is very similiar to wrok done in a gravity field.

We determined the work done in an electric field with different path. The formula we used here is W = EQcos(a), and we applied dot product here.

We draw the equal potential surface around a charging particle. We found that for a single partice, the equal potential surface is just a cricle

This is the output we predict for a simple phyton program. We are gonna use this program to show the equal potential surface around a particle system.

Calculated by hand, we found the potential of a particular point in the charging particl system. The general rule is just add all potential difference that respect to each particla at that point together.

This is the out put for the original python code. It only outputs the position of the 2 particle and the potential difference at 2 points

Simliarly, This is the output for the potential difference at 3 random point respect to this charging particle system.

Summary: A parallel circuit can reduce resistance while a series circuit can increase resistance.

Electric field is same as gravitational field. The method to determing work done in the 2 different field is same. The only difference is the type of force and constant is different.

To calculated the total potential difference at a point, we just add the potential difference at it respect to each particle together. Dont forget the sign.