ECT122 W7 ILab 1
Thevenin’s Theorem
1. What is Thevenin’s theorem? What purpose does it serve?
Thevenin’s theorem states that any resistive circuit or network, no matter how complex, can be represented as a voltage source in series with a source resistance. It is used to simplify the load analysis of series-parallel circuits.
2. What is VTH ? How is it measured?
Thevenin voltage. In a series-parallel circuit is the voltage present at the output terminals of the circuit when the load is removed. Even though it has a new name VTH is nothing more than the no-load output voltage VNL for the circuit. Vth can be found Vth= Vs R?/Rt.
3. What is RTH ? How is it measured?
This is Thevenin resistance. It is the resistance measured across the output terminals with the load removed. It can be thought of as the no-load output resistance RNL. You remove the load and the voltage source gets replaced by a wire. We remove the voltage source because for resistance to be measured accurately the source must be replaced with an equivalent resistance. Rth= (R?//R?) + R?
4. Given the circuit below, determine the Thevenin equivalent voltage and resistance.
VTH = ___7.33V____
Vth= Vs x R4/R3+R4= 10V x 330Ω/120Ω+330Ω= 7.33V
RTH = __88Ω____
Rth= R3//R4= 120Ω//330Ω= 88Ω
5. Download the Multisim file “Thevenin1” from Doc Sharing, week 7. Run the simulation and verify the simulated results are the same as the calculated values. Were the values the same? YES/NO. If No, why?
Yes. 7.333V.
6. Build the original circuit in question 4 on a breadboard. Connect the circuit’s input to the power supply and set it to 10V. Use the hand held DMM to adjust the supply to the accurate value. Measure the load voltage using the DMM. Have the professor verify the circuit before applying power. Measure VL1 and note below.
VL1 = __7.25V__
7. Construct the Thevenin equivalent circuit for the circuit above on a breadboard. Connect the circuit’s input to the power supply and set it to VTH. Use the hand
1. What is Thevenin’s theorem? What purpose does it serve?
Thevenin’s theorem states that any resistive circuit or network, no matter how complex, can be represented as a voltage source in series with a source resistance. It is used to simplify the load analysis of series-parallel circuits.
2. What is VTH ? How is it measured?
Thevenin voltage. In a series-parallel circuit is the voltage present at the output terminals of the circuit when the load is removed. Even though it has a new name VTH is nothing more than the no-load output voltage VNL for the circuit. Vth can be found Vth= Vs R?/Rt.
3. What is RTH ? How is it measured?
This is Thevenin resistance. It is the resistance measured across the output terminals with the load removed. It can be thought of as the no-load output resistance RNL. You remove the load and the voltage source gets replaced by a wire. We remove the voltage source because for resistance to be measured accurately the source must be replaced with an equivalent resistance. Rth= (R?//R?) + R?
4. Given the circuit below, determine the Thevenin equivalent voltage and resistance.
VTH = ___7.33V____
Vth= Vs x R4/R3+R4= 10V x 330Ω/120Ω+330Ω= 7.33V
RTH = __88Ω____
Rth= R3//R4= 120Ω//330Ω= 88Ω
5. Download the Multisim file “Thevenin1” from Doc Sharing, week 7. Run the simulation and verify the simulated results are the same as the calculated values. Were the values the same? YES/NO. If No, why?
Yes. 7.333V.
6. Build the original circuit in question 4 on a breadboard. Connect the circuit’s input to the power supply and set it to 10V. Use the hand held DMM to adjust the supply to the accurate value. Measure the load voltage using the DMM. Have the professor verify the circuit before applying power. Measure VL1 and note below.
VL1 = __7.25V__
7. Construct the Thevenin equivalent circuit for the circuit above on a breadboard. Connect the circuit’s input to the power supply and set it to VTH. Use the hand