Day8 3/17 Theveninb

Today, in class, we first learn about Thevenin's Therorem.

In this photo, we let RL=6 ohms and use everycircuit in computer to show the 

current and voltage.

In this photo, we did another example to understand thevenin therorem. We find the thevenin equivalent by R

Lab: Thevenin's Theorem

Purpose:We need to show the work of Thevenin's Theorem. We will determine a Thevenin equivalent for a given circuit; then determine the Thevenin resistance and the open circuit voltage to create the Thevenin equivalent circuit.
Pre- lab Question:

In this photo, we first find the olad resistor Rth=RL=7.4kohm, then we use the mesh equtions to find the Vth=0.46V.

In this photo, we use every circle to check our work and we find what we get is correct.

In this photo, we measure the true value of our resistor that we use in the circuit. The differences of the resistor might be a source of errors in this experiment. 

In this photo, it is our set up of this experiment.

Then we use the set up tp measure that the Vth=0.451V

In this photo, we find the percent error of Vth is 2.17%, then we put the load resistor into the circle and find that Vth=0.2V and find the percent error is.-1.5% 

In the next, we use a potentiometer to replace the load resistor. It can provide various resistance . We measured the resistance of the potentiometer, and record the voltage across it

 In this photo, it is the set up of the circuit.

In this photo, we change the value of resistor of potentiometer and measure the V and then calculate the power.

In this photo, We get  average power is 1.13*10^-6, maximum power to be 1.84*10^-6 W, when the load resistance is 620 ohm. 

Summary:

In today’s lab, we learn about Thevenin’s Theorem, and build circuits using Thevenin’s Theorem.