last day, june 3rd

Again, it is a lab day. We still work with solving for Vrms and Irms. We draw a diagram to record what we have and what we solve. We used the inductor board and function generator to build our circuit. Based on the formula, we solve for Vrms and Irms.

Later we solve for the power and Vrms and Irms for another inductor, and we draw a graph of the frequency.

This is the diagram that shows our set up, and it also obtains the data for other components we used for this experiment.

May 29

This is the graph we measured in an AC circuit that invloves resistor, capacitor and inductor. This graph is we measured with resistor in an AC circuit.

This is the set up for our circuit.

We write every experimental value and calculated value on it, including Irms and Vrms. Also, we calculated the percent difference between real value and our calculated value.

we use calculus to derive the expression for Vmax, Vrms, Imax and Irms.

This time we measured with capacitor in our AC circuit. This time, we calculated some value we need for this experiment on the white board.

This is the graph we have for our second experiment that involves capacitor. Based on this graph, we find Vmax and Imax, and we show the relationship between V and I.

Same as before, we write our all values and board, and calculate Vrms and Irms, and calculated the percent difference.

This time we involves inductor, based on formula we derived before, we solve for the Irms for the AC circuit.

summary:

It is all experiment, and each experiment takes time to perform. By setting AC circuit with capacitor, inductor and regular resistor, we can easily the difference between those 3 different component in an AC circuit.

Error:

Before today's lab, on May 27, we did a lab that performs same thing, however, we connect with inductor.

Before the experiment, we calculated Vrms and Irms.

This is the graph we got from the AC circuit that connected with inductor.

may 27

We are given an inductor, and we picked a normal resistor. Together with a function generator, we make an AC circuit. This is the inductance and resistance we calculated for the AC circuit.

This is the frequency we calculated for the circuit.

setting the frequency as we calculated, we got this graph.

By changing frequency and function settings, we got this graph.

We continue activities from our lab maual to calculate and observe inductors in an AC circuit.

This is the activity we performed on the internet to help us getting familiar with inductor. Since it is similiar with capacitor, we derive some of those answers based on concept we learn before.

This is answers we had for the activity above.

We also perform a exercise that related to time constant. Within this circuit, we calculated time constant for each loop, and voltage and current change that has inductor and without inductor.

summary:

Inductor is similar to capacitor, and the relationship of voltage and current to time is almost same to those relatioship we learned in capacitor chapter. It has time constant, and the relationship of inductor and magnet is that a changing current in a coil also induces an emf in that same coil. Such a coil is called an inductor, and the relationship of current to emf is described by the inductance

 

Before the exam

We perform an activity that related to change of magnetic flux and the emf.

Within those activity, we observe the relationship of the rate of the change of magnetic flux and the emf produced by the magnetic field.

This is those quedtion we answered for the activity we did above.

We also performed an experiment. This time, we use a bar and let it move in the magnetic field to let the magnetic flux change.

Perform like the experiment, we practice an activity on the computer, and answer some questions like we did at the begining of the class. However, this time, we obtain the velocity of the bar.

We answer the questions from the activity. We observe that the emf if related the velocity of the bar, cause the motion of the bar change the magnetic flux, which produce emf together witht the magnetic field.

We are introduced a new concept, induction. It is similiar to capacitor we talked about before. A changing current in a coil also induces an emf in that same coil. Such a coil is called an inductor, and the relationship of current to emf is described by the inductance

we draw the graph to show the relationship between current and time, and the difference of this relationship between normal resistor and inductors.

This is the third activity we did, and this one practice to observe inductor. We answer some question to observe the relationship and components of an AC circuit that has inductor.

This is answers for question we did for the activity above

Same as capacitor, we have time constant for inductor. however, for capacitor, time constant is RC while for inductor, it is L/R, and the graph is still a function of e to some power that contains time and time constant.

Summary:

change of magnetic in magnetic field produce emf, so there will be many method to produce emf.

Inductor is different from regular resistor, but performs similar like a capacitor, and there is also a time constant for it.