The Printing Press & the Telegraph
Who invented the printing press?
Johann Gutenberg
Who invented the telephone?
Alexander Graham Bell
What is the benefit of radio?
Wireless transmission of signals
How do communication satellites help us?
They transmit signals further and allow us to have connection to even remote places in the world
What are computers amazing at?
Math! They can do many calculations accurately
Why was the printing press such an important invention?
It allowed for mass printing and distribution of texts such as the Bible
How does a telephone work?
Which would sound clearer: Digital or analog waves
Digital, less interference from surrounding objects
What was the first communications satellite?
Sputnik - launched by the Russians in the 50s
What is the CPU? What does it do?
The central processing unit, it receives and sends signals to the computer to tell it what to do
What are the parts of the telegraph?
Key, receiver, and wire
Cell phones turn sound waves into _____ waves.
Radio
Red, green and blue
Describe a geosynchronous orbit
High earth orbit, the speed matches the rotation of the earth in order to stay locked on the same position on the earth
What is RAM?
Random access memory, the short term memory of the computer
How does a telegraph work?
An electric circuit is completed when the key is pressed, activating an electromagnet at the receiver that will move a magnet and cause an audible click
What are the parts of a telephone?
Microphone, phone line/wires, receiver, speaker
Liquid crystal display (LCD) or organic light emitting diodes (OLED)
How many satellites must a GPS receiver receive a signal from in order to have an accurate location?
4 GPS satellites
What is the difference between hardware and software?
Hardware = physical items you can see and touch and use
Software = what makes the computer actually function, the programs on it