Day 26

In this class, we learned the RLC circults. In a RLC circult, it connects resistance, inductance, and capacitor. And we do a problem First the resonance frequency was found. Then the current was found at a resonance frequency of 3 kHz. Afterwards the power dissipated at that current was found. We use Pavg because power is stored, not dissipated.

Resonance in RLC Circuit

An RLC circuit was set up, the theoretical resonance frequency can be solved by using values of the inductor and capacitor found with the multimeter. And we use the function generator to find the experimental resonance frequency

In the part two, the experimental impedance was found by the measured values from the multimeter, from the formula Z=((R^2 + (Xl-Xc)^2)^1/2. Finally that value was comparedto the theoretical value of impedance; Z=R.

In part three, the theoretical frequency and experimental frequency were found using LoggerPro. As we can see on the graph, there is a phase angle difference of 180 degrees. If the frequency was increased, the amplitude decreases when measuring across the capacitor and the amplitude increases when measuring across the inductor.

When we increase the frequency, amplitude decrease when measure capacitor. And amplitude decrease when measure inductor.

Transformers

 A transformer is made by making two inductors together by two coil. The coil redirects magnetic flux in one inducto to other one, then other one produces a field too, so that the second coil will produce a current. Since, the second coil produce a voltage and gain energy. from first coil.

Day 25

Resistors in an Alternating Circuit 

When we are studying the  Alternating Circuit, we connected the function generator resistor and current meter in series. The potential vs. Time, Current vs. Time, and potential vs Current .

 Capacitors in an Alternating Circuit 

When studying a capacitor in an alternating circuit, the same set up from the resistor was used expect now the resistor is replaced with a capacitor. In AC circuits, capacitors exhibit a resistance. 

Inductors in an Alternating Circuit

When we are studying Inductors in an Alternating Circuit, we used the same set up as previous part except now we are replacing a capacitor by inductance in an AL circuit. Then we collected data and graphs from LoggerPro.

In the final part of the lab, a RC cirtuit in AC was studied. A resistor and a capacitor was hooked up to a function generator and a current meter and volt meter were connected to LoggerPro. Using the graphs the Vmax and Imax were found and the Vrms and Irms. The total resistance within the circuit is the total impedance, or Z.

We then calculate the percent difference for the impedance as well as time phase change. 

Day 24

The formula about L(Inductance)

Inductance was studied through ActivPhysics. Questions 1-8 were answered. 

In this lab, we set up a circuit with containing a function generator, a resistor, and an inductor. At the same way, a voltmeter was used in order to help us to find the voltage across the resistor and inductor. All data gathered was recorded on the white board photo below. 

Day 23

Force Due to a Magnetic Field 

In this experiment, we did two experiment. First one, when two wires with same direction current, they attract each other. Second one, when two wires with different direction, they repel each other. Because two same direction current both produce field, and in the mid of two wires, their field is opposite, so they attract each other. However, in the opposite current, in the mid of the two wire, the field is same direction, so they repel each other.

In this experiment, a solenoid is used to check field. And in the experiment, we use a test tube with wire loops with current, so that the test tube produce field. Then, we move the test tube with current to close the solenoid and record the largest field value. In the same way, we increase the number of loop, and find the max field value.

 

Lenzs' Law
Changing Field produces current

In this experiment, professor mason use a magnet go though a coil. And we connect an amperemeter to the coil. During professor use the magnet go though coil, we see the amperemeter's Pointer moves. When the magnet goes though the coil, the field to the coil change, so the coil's field changed, then field produce current.

 In this experiment, professor mason, thrown two magnet into two hollow stick, aluminum stick and plastic stick. Professor mason drops then at same time, but we find the magnet in the plastic out early. In the aluminum, the magnet out later. Because when magnet fall in the aluminum stick. The aluminum stick produces a field against the magnet's field, so a force push magnet back. After the magnet leaves stick, a fore that attract the magnet is produced.