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# ECT122 W4 ILab 2

By sunshineangel531 Jan 21, 2015 475 Words
﻿ECT 122 Week 4 iLab #2

Parts:
DC Power Supply
Hand Held DMM
Wire
220 Ω resistor
560 Ω resistor
1.0kΩ resistor

1. State Kirchhoff’s Current Law.
The algebraic sum of the currents entering a node is equal to zero.

2. What is the equation for the total current in a parallel circuit? It= I1+I2+I3….

3. Determine the total current in the following nodes.
1) It= 2mA+4mA+6mA= 0.012x10^-3=12mA
2) I + I1+I3= I2
I= 2mA+4mA= 1mA
I= 1mA- 6mA
I= -5mA

4. Determine the total current in the following circuit.

It= I1+I2+I3= 10mA+20mA+40mA= 0.07 x 10^-3= 70mA

5. If VS = 10 V in the circuit above, what are the following voltages?

R1= V/I= 10V/10mA= 1000 x 10^3= 1kΩ
R2= V/I= 10V/20mA= 500kΩ
R3= V/I= 10V/40mA= 250kΩ

Vr1= IR= 10mA x 1kΩ= 10V
Vr2= IR= 10mA x 500kΩ= 10,000 x 10^3= 10V Vr3= IR= 10mA x 250kΩ= 10,000 x 10^3= 10V

6. Download the Multisim file “Parallel2” from Doc Sharing, Week 4. Calculate the values below.

IT1=__49.2mA____IR1=__10mA____IR2=__17.9mA___IR3=___21.3mA____

V1=___10V______VR1=__10V_____VR2=___10V______VR3=__10V_______

Ir1= Vs/R1= 10V/1000Ω= 0.01 x 10^-3= 10mA
Ir2= Vs/R2= 10V/560Ω= 0.01785 x 10^-3= 17.9mA
Ir3= Vs/R3= 10V/470Ω= 0.021276 x 10^-3= 21.3mA
It= Ir1+Ir2+Ir3=10mA+17.9mA+ 21.3mA= 0.0492 x 10^-3= 49.2mA
V=IR V1= 10mA(1000Ω)= 10V
V2= 17.9mA(560Ω)= 10V
V3= 21.3mA(470Ω)= 10V

7. Using Multisim, simulate the circuit. Use the appropriate test equipment and measure the following values.

IT1=__0.049A____IR1=__10mA__IR2=_17.85mA__IR3=_21.275mA__

V1=__10V______VR1=_10V______VR2=__10V_____VR3=__10V____

8. Prototype the circuit below on the breadboard. Connect the circuit’s input to the variable +12 V supply. Turn on the DC power supply and use the handheld DMM to set it to +10V. Using the handheld DMM, measure the values below. Remember, to measure current, the handheld DMM must be in series with the resistor. Have the professor verify the circuit before applying power.

IT1=_75.1mA___IR1=_10.4mA_____IR2=__18.4mA_____IR3=__47mA_____

V1=__10V______VR1=___10V_____VR2=____10V____VR3=___10V_____ Ir1= Vs/R1= 10V/1kΩ= 0.01 x 10^-3= 10mA
Ir2= Vs/R2= 10V/560Ω= 0.01785 x 10^-3= 17.9mA
Ir3= Vs/R3= 10V/220Ω= 0.04545 x 10^-3= 45.4mA
It= 10mA+17.9mA+45.4mA= 0.0733 x 10^-3= 73.3mA

9. If using ELVIS, use the ELVIS DMM and verify that the following values match the handheld DMM measurements. If NOT using ELVIS, skip to step 10.

IT1=____________IR1=____________IR2=____________IR3=____________

10. How do the measured values compare to the calculated value? Are there any significant differences (YES/NO)? If yes, why? They were the same. No differences.

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