Download presentation
Presentation is loading. Please wait.
Published byMelanie Tate Modified over 8 years ago
1
CHAPTER 2
2
Open Circuits Closed Circuits Open Switch = device is off Stops the circuit Closed switch = device is on Batteries have connections at both ends so charge can follow a closed path
3
CircuitShort Circuit Follows the path of the least resistance Intended path Useful path Controls current Follows the path of the least resistance Unintended path Accidental damage to wire Dangerous
4
Fuses: ◦ Consists of a metal strip that is inserted into the circuit ◦ A safety device that opens a circuit when there is too much current in it (metal strip melts) “Fuse is blown” ◦ Will automatically shut off the current ◦ Usually in older homes and buildings Circuit Breakers: ◦ Automatically open the circuit when too much charge flows through it ◦ Do not have to be replaced every time they open the circuit (unlike fuses) ◦ Wire inside will grow hot and expand flips the switch off ◦ Once problem is solved, switch can be manually flipped to on again
5
Chapter 2.3
6
A code is a system of symbols used to send a message ◦ Language Electronic device – uses electric current to represent coded information ◦ Signals use variations in the current ◦ Examples: computers, DVD players, gaming systems, etc.
7
Coding system consisting of 2 choices In electronics 2 choices is “on” or “off” ◦ The result: message represented in pulses of current Should I wear a jacket? Is it raining? Is it hot outside? Wear a light jacket Wear a raincoat Wear no raincoat NO YES
8
Information that is represented in numbers, or digits Circuit that is OFF = represented by 0 Circuit that is ON = represented by 1 Digital information is represented in long streams of digits ◦ Each 0 or 1 is also known as a bit (short for binary digit) ◦ A group of 8 bits = byte ◦ Gigabyte = 1 billion bytes (8 billion 0s and 1s)
9
0001; 0010; 0011; 0100; 0101 0110; 0111; 1000; 1001; 1010
10
Information that is represented in a continuous but varying form Example: microphone ◦ records sound waves as analog information ◦ Sound waves vary in strength ◦ In order for signal to be burned onto a CD, its converted into digital information
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.