ECT122 W4 ILab 2

ECT 122 Week 4 iLab #2

Parts:
Breadboard
DC Power Supply
Hand Held DMM
Test leads
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.