Title: Lab 11-6: DC Parallel Push Button With LEDs - 2 Hour
Course: Basic Electrical Theory and Wiring (Sandbox) > Section: Module 11: Parallel Circuits

Introduction

This is your last lab on parallel circuits. Use what you have learned thus far.

Instructions

Watch the example video, and then perform the lab.

1. Follow the guidelines on the Lab Expectations page.
2. Print off the drawing template found at the start of Module 11. (If you cannot print the drawing, draw the template on a piece of paper.)
3. Write your initials in the "Drawn By:" section of the template drawing.
4. Write the date in the "Date:" section of the template drawing.
5. Write the lab number in the "Drawing #" section of the template drawing.
6. Write the title of the lab in the "title" section of the template drawing.
7. Legibly draw up the following schematic using the drawing template and drawing legend. (Note: Refer to AMAR-1200-01 - AC Amps Measurement.pdf and AMAR-1200-02 - DC Amps Measurement.pdf found in previous modules for examples on how to properly draw a schematic.)
8. Draw 24VDC Power Supply.
9. Draw a push button that turns on two parallel LED's. Make sure to put a 1 KΩ resistor in front of each LED.
10. Label all wires with the appropriate color.
11. Wire up the circuit per your drawing.
12. Show that the circuit works.
13. Measure the voltage in several spots in the circuit. Understand what the voltage is doing through the circuit.
14. Measure the current across each LED.

 | Note |
You can add a jumper wire in front or back of the LED to measure the current as shown in the example below.

Clamp the meter around the jumper wire and zero it. Then press the button to turn on the LEDs and measure the current. This will give the best results.

1. Measure the current into the push button.

 | Note |
To measure the current into the push button, clamp the Extech around the wire coming into the push button.
Clamp the meter around the wire and zero it. Then press the button to turn on the LEDs, and measure the current. This will give the best results.

2. Answer: What happened to the voltage and the current?
3. Answer: If I were to keep adding LEDs in parallel with the 1k Ω resistors, how many could I add?

 | Think About it! |
In a parallel circuit what stays the same, the voltage or the current?
How much current does a single LED use?
How much current can the power supply provide?

Materials

ID | Item | Image | Qty for Kit | In Kit 2290039
13 | Multimeter (Greenlee) |  | 1 |
14 | Multimeter (Extec) |  | 1 |
17 | Wire Strippers |  | 1 |
22 | 24 VDC Power Supply |  | 1 |
23 | Push Button (Breadboard) |  | 1 | X
25 | 1/9" x 1.3" Breadboard |  | 1 | X
27 | Male-Male Jumper Wires |  | 1 | X
30 | Red LED |  | 6 | X
40 | 1K 1/4 W Resistor |  | 10 | X
53 | 22 AWG Blue Wire |  | 250 Feet |
54 | 22 AWG Brown Wire |  | 250 Feet |

- Pencil
- DWG Template - AMAR-1200-XX - Blank.pdf
- DWG Legend - AMAR-1200-00 R1- Legend.pdf

Submission

What to Submit

- Submit a photo per the rubric below.
- Submit a video per the rubric below.

 | Remember! |
 | You will need to submit a picture and a video for this assignment. If you only submit one, don't worry. You can always resubmit with the missing piece and both will be visible to the instructor. |

How to Submit

Click here for step-by-step instructions on how to submit your materials.

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