Resistance | Pull up Resistor | Pull down Resistor | Why we use pull-up and pull-down resistor

Pull up Resistor | Pull down Resistor | Why we use pull-up and pull-down resistor
What does a pullup resistor do?
Why we use pull-up and pull-down resistor?
How big should a pull-up resistor be?
What is better pull-up or pull-down resistor?
Why use 10k pull-up resistor?
How do you wire a pull-up resistor?
Why do we need resistor for LED?
Why does Port 0 needs pull-up resistors?
Which port required external pull-up resistor?
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Calculating Resistor Values
The Resistor Colour Code system is all well and good but we need to understand how to apply it in order to get the correct value of the resistor. The “left-hand” or the most significant coloured band is the band which is nearest to a connecting lead with the colour coded bands being read from left-to-right as follows:
Digit, Digit, Multiplier = Colour, Colour x 10 colour in Ohm’s (Ω)
For example, a resistor has the following coloured markings;
Yellow Violet Red = 4 7 2 = 4 7 x 102 = 4700Ω or 4k7 Ohm.
The fourth and fifth bands are used to determine the percentage tolerance of the resistor. Resistor tolerance is a measure of the resistors variation from the specified resistive value and is a consequence of the manufacturing process and is expressed as a percentage of its “nominal” or preferred value.
Typical resistor tolerances for film resistors range from 1% to 10% while carbon resistors have tolerances up to 20%. Resistors with tolerances lower than 2% are called precision resistors with the or lower tolerance resistors being more expensive.
Most five band resistors are precision resistors with tolerances of either 1% or 2% while most of the four band resistors have tolerances of 5%, 10% and 20%. The colour code used to denote the tolerance rating of a resistor is given as:
Brown = 1%, Red = 2%, Gold = 5%, Silver = 10 %
If resistor has no fourth tolerance band then the default tolerance would be at 20%.
It is sometimes easier to remember the resistor colour code by using short, easily remembered sentences in the form of expressions, rhymes, and phrases, called an acrostic, which have a separate word in the sentence to represent each of the Ten + Two colours.
Bad Boys Ring Our Young Girls But Vicky Goes Without
Better Be Right Or Your Great Big Venture Goes Wrong
Buster Brown Races Our Young Girls But Vicky Generally Wins (This one indicates the position of Brown
Bad Booze Rots Our Young Guts But Vodka Goes Well (in) Silver Goblets (This one includes the tolerance bands of Gold, Silver)
As an added bonus, why not download and make our handy DIY Resistor Colour Code Wheel as a free and handy reference guide to help work out those resistor colour codes.
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[@RcEgyan]

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[@RcEgyan]

Already uploaded

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