What is a system?
A system is a group of interrelated parts that perform a
specific function
What is an input?
An input is the voltage, current or power that is applied
to an electrical circuit to achieve a desired result
What is an output?
The result obtained from the system after
processing its input(s)
What is an electrical system?
An electrical system deals with electric power
What is an electronic system?
An electronic system deals with signals; changing electrical or electromagnetic quantities that carry information
What is an electrical circuit?
An electrical circuit must form a complete path from a
power or signal source to a load, and back to the source
What is a block diagram?
A block diagram (flowchart) is a model of a system that represents its structure in a graphical format using labelled blocks to represent functions and lines to represent the signal flow
What are analog quantities?
- Quantities that have continuous values over a limit range such as time.
- Most natural quantities that we see are analogue and vary continuously.
What can digital systems do?
Digital systems can process, store, and transmit data more efficiently but can only assign discrete values to each point
What are analog signals?
A waveform that continually varies in a certain manner
Give examples of analog signals
- Sine waves
- Sound waves
- Amplitude modulated (AM) signals
- Frequency modulated (FM) signals
What are digital signals?
A waveform that represents a sequence of discrete
values (1’s and 0’s)
What is digital modulation?
- Digital modulation provides a means of transmitting
data from one system to another (such as a form of wave). - It affects the bandwidth of the transmitted signal
What does Pulse-code Modulation (PCM) do?
- PCM uses a sequence of digital codes (binary values) to represent a sampled analog signal
- The higher the sampling rate, the more accurate the digitized waveform
What are the two circuit states that digital electronics uses?
- They are represented by two different voltage levels called HIGH and LOW
- The voltages represent numbers in the binary system
What is a single number called in binary and value can it have?
- A bit
- A bit can have the value of either a 0 or a 1, depending on if the voltage is HIGH or LOW
What do digital waveforms do and what are they?
- Digital waveforms change between the LOW and HIGH levels
- A Digital Waveform Carries Binary Information
What is a positive-going pulse?
One that goes from a normally LOW level to a HIGH level and then back again
What is a negative-going pulse?
One that goes from a normally HIGH level to LOW level and then back again
What is a pulse?
A sudden change from one level to another, followed after a time, called the pulse width, by a sudden change back to the original level
What are periodic and Nonperiodic pulse waveforms?
- Periodic are composed of pulses that repeats in a fixed interval called the period
- Nonperiodic has no pattern
What does a timing diagram show?
A timing diagram is used to show the relationship
between two or more digital waveforms
How can data be transmitted and which one is faster?
- Data can be transmitted by either serial transfer or
parallel transfer - Serial transmission is faster as you only have one line to stabilise
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Materials - Week 234
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Manufacturing Processes - Week 321
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Historical drivers - Week 17
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Practical sessions - 2-stroke Engines11
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Manufacturing Processes (Cutting & Forming) - Week 451
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Manufacturing Processes (Joining) - Week 512
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Practical sessions - Electrical drill43
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Electronic systems23
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Number Systems, Operations, and Codes11
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Logic Gates and Gate Combinations38
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Combinations Logic15
