RC - Circuit

In RC-Circuit,there are a battery,a capacitance,and a resistor. When the circuit is close access, the capacitance begins to store charge. When the circuit takes out the battery, and forms close access, the capacitance is instead of battery to release charge. In this activity, the lab is instead of resistor. When we turn on the the battery, the lab is from bright to turn off because charge store in the capacitance.

When we used two capacitance in the circuit, and the two capacitance were series, the lab would turn off later than the fist activity because the series capacitance make the total capacitance become small. The capacitance became small, so it stored less charge than the fist activity,and the lab could bright longer than the fist activity.

When the two capacitance were parallel, the lab would turn off faster because the parallel capacitance made the total capacitance become large. It could store more charge.

 This picture showed the capacitance was charge in RC-Circuit.

This picture showed the capacitance was discharge in RC-Circuit.

This graph showed the voltage of capacitance vs. time in charge of RC-Circuit and discharge of RC-Circuit.

Therefore the Voltage have a relationship with the capacitance and resistor

The last picture showed the current and voltage of capacitance vs. time, and the current and voltage of resistor vs. time. 

Capacitance

We cut two same area raps, and put them to inside of the book. The two raps is set in different pages, then we calculated the capacitance in the different distance of two raps at 1 cm, 10 cm, and 20 cm. Next, we used the half areas of the two raps, and we calculated the capacitance in different distance of two raps at 1 cm, 10 cm, and 20 cm.

From the data and graph, we knew that the capacitance has relationship with the area of plate and the distance of the two plates.

Calculating the sum of the capacitance in series and parallel

Potential

Power and Work

This activity showed that the temperature can affect the work and the power. When the temperature rose, the power and the work followed increase.
The hot dog activity

This picture showed the work of a cylinder in the electric fired. Different angles of cylinder had different work.

Current, Voltage, Resistance, and Power

In this question, we selected mode D

This activity showed measuring of current of resistance and voltmeter and voltage of battery, then, calculating the power of resistance and the power of voltmeter.

This picture showed the data and graph for measuring numbers and calculating numbers. From the graph, we knew that current, voltage, and power have relationship. They are direct ratio.

The resistance has relationship with density, length, and area. From the formula, we knew that the length and density is big, and the area is small, so the resistance is big.

This data showed different material,length, and area have different resistance.

Electric Field Lines and Flux

Flux as a Function of Surface Angle
We use the mechanical model, a protractor. We should measure the number of the lines, and then, we use the measure of the lines to calculate the the angle of degree and the radians.

Plot the flux as a function of radians. The graph showed the flux which was a curve. From the graph, we knew that the flux has relationship with the angle and radians.

The flux equals the dot product of the vectors of electric field  and the vector of the area. In other words, the flux equals the electric field multiply the area, and multiply cosine the angle between the electric field and the area.

This picture showed  the flux into or out of an oval and electric flux with two charges. From the activity, we knew if the area has flux, the flux must have a charge or more charges inside the flux.

Electrostatic Forces

Interactions of Scotch Tape Strips
Two 10 cm strips of Scotch tape on the table with the sticky side down. The end of each tape should be curled over to make a non-stick handle. Peel one tape off the table and bring the non-sticky side of the tape toward another strip. The two trips of tape on the table sticky side down and label them "B" for bottom. Press another strip of tape on top of each of the B pieces; label these trips "T" for top. Pull each pair of strips off the table. Then pull the top and bottom strips apart.

The picture showed the interaction between two top strips when they were brought toward one another, the interaction between two bottom strips, and the interaction between a top and a bottom strip.

Drawing a free body diagram for the ball being suspended at an angle. Using free boy diagram to derive an expression for the electrical force acting on the hanging ball. Using some trigonometry and measuring values to come up with a way of calculating angle, then using the New Calculated Column function of logger Pro to go from measuring values to a value for the electrical force acting on the hanging ball.  Let make the length is L and separation distance is X.

The picture showed the calculation of the electrical force and the body diagram.

Electric Force Law Video Analysis Activity

Note that you are seeing a ball and the lower part of a 2.00 m long string. The mass of the ball is 2.93 g. A charged ball on a stick being brought in horizontally toward the hanging ball. In this activity, we use the conclusion to calculate.

This graph showed that the charged ball of the whole video move direction and way. It was also showed the measure of the changed ball in the whole playing.