Day 08 03/19/2015 Getting Started with EveryCircuit, Thevenin's Theorem

Getting Started with EveryCircuit

Circuit need to set up by 

web: everycircult.com/app/

Result

Practice

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Thevenin's Theorem

The main purpose for this lab is to be able to determine the Thevenin resistance and the open-circuit voltage

The circuit must set up

prelab calculation of Voc and RL

On calculation of RL, we need to first ignore all the power source (Hint: on Thevenin Theorem power source can be off if needed to calculate anything) Then we can simply find the RL by combine all resistance by either parallel or series method. 

The Voc can be find by first calculate I1 and I2 then solve V1 and V2 by times current I1 and I2 by its resistance then the Voc can be simply solve out by adding to voltage.

circuit set up

Step 2

Voc

Thevenin resistance

On Step two we measure the voltage (Voc) across terminals a-b and Thevenin resistance(Rth) at terminals a-b. 

The result come out is very closed to our theoretical value from pre-lab.

Step 3

Voltage across terminal a-b

On step 3 we determine pick a load resistance RL  (4k<RL<10k) range.

We picked 7.9 kmo.

We know the Va-b must be Voc / (Rth + RL ) * RL

As the result the experimental value is very closed to out theoretical value.

Step 4

set up Thevenin circuit

The circuit is simplify to a series which transistor is 7.2 kmo and a power supply with RL 7.92kmo.

Then we measure the Va-b again which here is transistor and I got value of 0.28V which is very close to the one I has on Step 3 which is 0.242V.

Step 5

Set up Circuit which one is Rth=7.2kmo and another one is the one for me to simply change resistance.

minimum

maximum

Data Table

On the setup I measure the resistance with different method 

On transistor there are three branch and I measure resistance on the center branch and the other one that not connect to the circuit. As the result Rload should equal to Rmax - Rmeasured.

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Class Work

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