Let V1=12V, R1=50 ohms, R2=10K ohms, R3=2K ohms, and R4=500 ohms. RL represents the load placed on the circuit between points Aand B.
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1 Questions on Thevenin Equivalent Circuits Fall Thevenin Circuits (25 points) Let V1=12V, R1=50 ohms, R2=10K ohms, R3=2K ohms, and R4=500 ohms. RL represents the load placed on the circuit between points Aand B. a) Find the Thevenin voltage between A and B (7 points) b) Find the Thevenin resistance between A and B (7 points)
2 c) Draw the Thevenin equivalent to the circuit shown on the previous page. Include the load resistor RL. (3 points) d) What would be the voltage from A to B if RL were 2K ohms? (2 points) e) What would be the voltage from A to B if RL were 10Meg ohms? (2 points) f) You use the DMM to measure the voltage across the load resistor given in part c (2K ohms) and part d (10Meg ohms). In which circuit would the measured voltage be closer to the voltage you calculated? Why? (4 points)
3 Fall 2004 solution (none available)
4 Spring ) Thevenin circuits (20 points) In the circuit above, V1=6 volts. R1= 50Ω, R2= 500Ω, R3= 800Ω, R4= 3000Ω a) Find the Thevenin Voltage (Voc) of the Circuit (8 points) b) Find the Thevenin Resistance (8 points) c) If you place a load resistor of 2K between A and B, what would be the voltage at point A? ( 4 points)
5 Spring 2004 solution 2) Thevenin circuits (20 points) A: In the circuit above, V1=6 volts. R1= 50Ω, R2= 500Ω, R3= 800Ω, R4= 3000Ω a) Find the Thevenin Voltage (Voc) of the Circuit (8 points) VA = [(R2+R3)/(R1+R2+R3)]V1 = (1300/1350)6 = 5.78 V VB = 0 Vth = VA-VB = 5.78V b) Find the Thevenin Resistance (8 points) A ---R R B +----R2----R3--+ Rth = R4 + [(R1*R23)/(R1+R23)] R23= =1300 Rth=3000+[(50*1300)/( )]= ohms Rth=3048 ohms c) If you place a load resistor of 2K between A and B, what would be the voltage at point A? ( 4 points) VA = [RL/(RL+Rth)]Vth = [2K/(2K+3048)]5.78 = 2.29V VA = 2.29V B: In the circuit above, V1=6 volts. R1= 50Ω, R2= 1000Ω, R3= 500Ω, R4= 2000Ω
6 a) Find the Thevenin Voltage (Voc) of the Circuit (8 points) VA = [(R2+R3)/(R1+R2+R3)]V1 = (1500/1550)6 = V VB = 0 Vth = VA-VB = 5.806V b) Find the Thevenin Resistance (8 points) [see pictures for A] Rth = R4 + [(R1*R23)/(R1+R23)] R23= =1500 Rth=2000+[(50*1500)/( )]= ohms Rth=2048 ohms c) If you place a load resistor of 2K between A and B, what would be the voltage at point A? ( 4 points) VA = [RL/(RL+Rth)]Vth = [3K/(3K+2048)]5.81 = 3.45V VA = 3.45V
7 Fall Thevenin Circuits (20 points) V2 R1 R2 R3 R4 A B Let V2=12V, R1=50 ohms, R2=1K ohms, R3=2K ohms, and R4=500 ohms. c) Find the Thevenin voltage between A and B (8 points) d) Find the Thevenin resistance (8 points) e) Draw the Thevenin equivalent circuit with a load of 4K ohms. (4 points)
8 Fall 2003 solution 2. Thevenin Circuits (20 points) V2 R1 R2 R3 R4 A B Let V2=12V, R1=50 ohms, R2=1K ohms, R3=2K ohms, and R4=500 ohms. f) Find the Thevenin voltage between A and B (8 points) Test A: Vth = V R23 R23=R2//R3=1K*2K/(1K+2K)= K V AB = K/( K+50)(12V)=11.16V V AB = 11.16V Test B: Vth = V R23 R23=R2//R3=2K*0.5K/(2K+0.5K)=0.4K V AB = 0.4K/(0.4K+50)(12V)=10.67V V AB = 10.67V g) Find the Thevenin resistance (8 points) Test A: Rth = R4 + R123 R123 = R1//R2//R3 1/R123 = 1/50 + 1/1K + 1/2K R123 = 46.5 ohms Rth = = ohms Rth = ohms Test B: Rth = R4 + R123 R123 = R1//R2//R3 1/R123 = 1/50 + 1/2K + 1/0.5K R123 = 44.4 ohms Rth = = ohms Rth = ohms
9 Draw the Thevenin equivalent circuit with a load of 4K ohms. (4 points) TEST A TEST B
10 Spring Thevenin circuits (20 points) a) (6 points) Find the Thevenin voltage (Voc) of the circuit assuming the load will be connected between A and B. b) (6 points) Find the Thevenin resistance. c) (4 points) Draw the Thevinen equivalent circuit with a load of 1K ohms. d) (4 points) Find the voltage between A and B for this circuit with a load of 1K ohms.
11 Spring 2003 solution 2. Thevenin circuits (20 points) a) (6 points) Find the Thevenin voltage (Vth) of the circuit assuming the load will be connected between A and B. R245 = R2+R4+R5 = 1k+5k+3k = 9k R2345 = R3 // R245 = (9kx4k)/(9k+4k) = 2.77k V2345 = V1(R2345)/(R1+R2345) = 15x2.77/(2+2.77) = 8.71 volts V4 = V2345xR4/(R2+R4+R5) = (8.71x5k)/9k = 4.84 volts Vth = 4.84 volts b) (6 points) Find the Thevenin resistance. R13 = R1//R3=(R1xR3)/(R1+R3) = (2kx4k)/(2k+4k) = 1.33k R1235 = R13 + R2 + R5 = 1.33K + 1K + 3k = 5.33 K R12345 = R1235//R4 = (5.33x5)/(5.33+5) = 2.58K ohms Rth = 2.58 K ohms c) (4 points) Draw the Thevinen equivalent circuit with a load of 1K ohms.
12 d) (4 points) Find the voltage between A and B for this circuit with a load of 1K ohms. VAB = (Vthx1K)/(1K+Rth) = (4.84x1k)/(1K+2.58K) = 1.35 volts VAB = 1.35 volts
13 Fall Thevenin circuits (20 points) R1 R3 V1 A B R2 R4 0 Given: V1=12 V; R1=2 kω; R2=4 kω; R3= 8 kω; R4= 4 kω a) Find the Thevenin Voltage (Voc) of the circuit assuming the load will be connected between A and B. (6 points) b) Find the Thevenin Resistance (6 points) c) Find the current going from A to B if a 4 kω resistor is connected between A and B. (8 points)
14 Fall 2002 solution 2. Thevenin circuits (20 points) R1 R3 V1 A B R2 R4 Given: V1=12 V; R1=2 kω; R2=4 kω; R3= 8 kω; R4= 4 kω a) Find the Thevenin Voltage (Voc) of the circuit assuming the load will be connected between A and B. (6 points) Vth = VA VB = V1*R2/(R1+R2) V1*R4/(R3+R4) Vth = 12*4K/6K 12*4K/(8K+4K) = 8-4 = 4 volts b) Find the Thevenin Resistance (6 points) 0 Redraw circuit: Rth = R1//R2 + R3//R4 = R1*R2/(R1=R2) + R3*R4/(R3+R4) Rth = 2K*4K(2K+4K) + (8K*4K)/(8K+4K) = 4/3 + 8/3 = 12/3 = 4 Kohms c) Find the current going from A to B if a 4 kω resistor is connected between A and B. (8 points) V=IR Vth = I* (Rth+4K) 4 = I * (4K+4K) I = 0.5 mamps
15 Spring Thevenin circuits (20 points) R1 2k R2 4k A 10V V1 R3 R4 1k 5k B 0 a) Find the Thevenin Voltage (Voc) of the Circuit (8 points) b) Find the Thevenin Resistance (8 points) c) Draw the Standard Thevenin Circuit, including a load Resistor ( 4 points)
16 Spring 2002 solution
17 Fall 2001 solution
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