Phys204 Lab10 Intro to circuits .pdf

File information


Original filename: Phys204_Lab10_Intro to circuits.pdf

This PDF 1.5 document has been generated by TeX / MiKTeX pdfTeX-1.40.11, and has been sent on pdf-archive.com on 19/10/2016 at 00:49, from IP address 149.4.x.x. The current document download page has been viewed 326 times.
File size: 451 KB (6 pages).
Privacy: public file


Download original PDF file


Phys204_Lab10_Intro to circuits.pdf (PDF, 451 KB)


Share on social networks



Link to this file download page



Document preview


Phys 204
Lab 11: Intro to Digital Circuits

The Breadboard
In this lab we are going to build basic circuits to demonstrate how digital circuits are
put together and developed.
One of the most important tools in this, and upcoming labs, is the breadboard. Breadboards are a way to prototype and experiment with circuit design without having to
solder components, which makes them convenient and reusable. Inside the breadboard
are metal connections that bridge rows or columns to establish an electrical connection
between components as follows:

Figure 1: Connections in a breadboard
The long rows on the top and bottom of the breadboard are usually reserved for positive
(red) and (negative) power connections. The columns in the middle are free to connect
components.

Resistors
We use resistors to regulate the voltage over certain components and don’t destroy them.
For example connecting a light-emitting diode (LED) directly to a 9V battery will cause
1

Phys 204: Lab 11

2

destroy the LED almost immediately because it cannot handle so much power. Therefore
we put a resistor in front of the LED to divide the voltage over the LED accordingly.
For most cases with LEDs a 1kΩ is sufficient.
Resistor follow the code:

Figure 2: Resistor code

Exercises
1. System.out.println(”Hello World!”);
The “Hello World” equivalent is a a simple circuit with a power supply, resistor and
LED. In all circuits we are going to use a 1kΩresistor.
Complete the following circuit:

Phys 204: Lab 11

3

2. Parallel circuits
The way breadboards are designed they make adding components in parallel simple and
convenient. For components to be connected in parallel the all the heads of the components (anodes) must be DIRECTLY connected to all the heads of the other components,
AND ALSO, their tails (cathodes) must all be connected DIRECTLY connected to each
other.
Complete the following circuit, first by adding one LED, then a second one to your
previous circuit:

What happens to the brightness of the LEDs as you add more? Explain your answer.

Phys 204: Lab 11

4

3. Series circuits
To create a circuit in which components are connected in series, the head of one component must DIRECTLY connect to the tail of another, with nothing else in between.
Complete the following circuit, first by adding one LED to a circuit with one LED, then
add two, for a total of 3 LEDs, as shown in the diagram:

What happens to the brightness of the LEDs the more you add? Explain your answer.

4. Series-parallel circuit
A series-parallel circuit involves components in which some are in series with each other,
and other are in parallel. Almost all circuits in everyday life fall into this category.
In the following example LED 1 and LED 2 are in series with each other because the
head of LED 1 is directly connected to the tail of LED 2. We will treat the resist before
the LED and the LED as one component for the purpose of simplicity. In the example
we can also see that LED 1 AND LED 2, which since we have said they are connected
in parallel we can treat them as one, say LED 1-2. Led 1-2 are in parallel connection
with LED 3 since the head of the LED 1-2 is directly connected to the head of LED 3,
AND, the tail of LED 1-2 is directly connected with the tail of LED 3.
Complete the following circuit:

Phys 204: Lab 11

5

Is there any difference in the brightness between LEDs 1, 2 or 3? Explain your answer.

5. Potentiometer
The potentiometer acts as a variable resistor, with resistance between two given values,
controlled using a dial.
Complete the following circuit:

What happens to the brightness of the LED as you turn the dial on the potentiometer?
Explain your answer.

Phys 204: Lab 11

6

6. RGB LED
The red-green-blue LED, inside there are 3 LEDs with a common cathode, therefore are
4 connections to the LED (anode for red, green and blue, common cathode).
Complete the following circuit:

What colour does the LED shine? What happens when you pull out one of the resistors.
Explain your answers.

Extra credit
Add potentiometers to your RGB LED circuit so you can adjust the voltage to each of
the red, green and blue LEDs. Draw a circuit diagram of your circuit in your lab report.
What happens when you adjust the potentiometers?


Related documents


phys204 lab10 intro to circuits
instruction manual
laser harp online instructions 5
hioki im3590 eng
an47fa
proposal

Link to this page


Permanent link

Use the permanent link to the download page to share your document on Facebook, Twitter, LinkedIn, or directly with a contact by e-Mail, Messenger, Whatsapp, Line..

Short link

Use the short link to share your document on Twitter or by text message (SMS)

HTML Code

Copy the following HTML code to share your document on a Website or Blog

QR Code

QR Code link to PDF file Phys204_Lab10_Intro to circuits.pdf