RESISTORS

let's see what are resistors-

Resistors are very common components in electronic circuits of all kinds. Their function is to resist the current flowing in the circuit, and how much resistance they provide is measured in ohms. Most are printed with either a color code or an alphanumeric code to indicate their ohmic value and tolerance -- how much their resistance may vary. Learning the codes, along with using a helpful mnemonic device, will allow you to identify resistors easily.

What is the meaning of the "tolerance" of a resistor?

That is the amount that a resistor may initially vary from its stated nominal resistance.This is at room temperature and when it is new.

For example a resistor with a tolerance of 10%, lets take an example of a 100 ohm resistor.The nominal value is 100 ohms, but the initial value at room temperature might be as low as 90 or as high as 110 ohms, which is plus and minus 10%.

As the resistor gets old it may change value some, that is known as aging. As it changes temperature, it may also change due to temperature coefficient. If you overheat it by dissipating more power or simply getting it too hot, you may shift its value permanently.So all these factors (and there’s more, too) can make the value of a resistor quite far from its stated value. Depending on how critical and sensitive the design is, it may or may not be a bad thing.High precision resistors minimize the tolerance, the temperature shifts and aging but cost relatively more.

The cheapest resistors are sold with a 20% tolerance. Aging and temperature effects can account for several percent more. High precision resistors with very low temperature coefficients can be had with 0.1% tolerance and are common in accurate industrial instrumentation.

What is Temperature Coefficient of Resistance?

Temperature Coefficient of Resistance (TCR) is the relative change of resistance value due solely to either the cooling or heating of the resistor.

⇛For more information on temperature coefficient of resistance click here.

RESISTOR COLOUR CODE CHART

USE THIS CHART TO FIND THE VALUE OF THE RESISTOR USING COLOUR CODE

Answers to the questions from the video on resistors on my channel-
to see my video on resistors click here

1) 270k Ω.   (k = *1000)
2) 5k Ω
3) 475 Ω
4) 22k Ω
5) 41 Ω
6) 4220M Ω.  (M = *million)