Science-Telegraph Flashcards
What is a telegraph?
A telegraph is a device that uses an electromagnet to send coded messages by closing and opening an electric circuit.
What is a key in the context of a telegraph system?
A key is a switch that completes the circuit in a telegraph system, allowing the transmission of coded messages.
What is a code used in telegraphs?
A code is a set of signals (like clicks and pauses) that represents letters or words used for sending messages.
How did the Pony Express work before the telegraph?
The Pony Express used riders and horses to carry messages quickly across the western frontier, taking 10 days to deliver a message from Missouri to California.
What did Samuel Morse invent in 1844?
In 1844, Samuel Morse sent the first message by telegraph, which used a code of clicks and pauses to send messages.
How did the telegraph change communication?
The telegraph replaced the Pony Express, allowing messages to be sent quickly over long distances using Morse code and electromagnetism.
What is the role of electromagnetism in the telegraph?
Electromagnetism is used in the telegraph to transfer information by opening and closing an electric circuit, generating magnetism that moves a steel strip to create signals.
How does the telegraph key work?
The telegraph key is a switch that, when pressed, completes the circuit and sends a coded signal via electromagnetism to the receiving end.
What materials are used to build a simple telegraph system in this lesson?
The materials include a circuit board, a cell holder, a rivet, wires, a switch, D-cells, and a steel strip.
What is the purpose of the steel strip in a telegraph?
The steel strip moves when electromagnetism is applied, allowing it to create signals (like clicks or breaks in the circuit) that represent coded messages.
What is the historical significance of the telegraph?
The telegraph was the most important tool for rapid communication for 32 years until the invention of the telephone in 1876.
How can you use the telegraph to send a message?
A message can be sent by pressing the telegraph key to create a series of coded signals (like Morse code) that are transmitted through the circuit.
How do you reinvent the telegraph using knowledge of energy and electromagnetism?
To reinvent the telegraph, you use electromagnetic principles, where electricity flows through a wire to create magnetism, sending messages in a coded pattern through the circuit.
What is the difference between the telegraph and a telephone?
The telegraph sends messages using coded signals (clicks and pauses), while the telephone allows people to hear each other’s voices in real-time.
