electronics for beginners

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Resistor Types


  • Metal Film - work from a thin film of metal or particles of metal are used to achieve different resistances.
  • Carbon Film - A thin film of carbon is laid upon a rod of ceramic and then a spiral groove is carved along the rod which controls the length of carbon between the contact and hence the resistance.
  • Wire Wound - One of the most accurate and stable, they consist of a wound coils of insulated wire, the length of which determines the resistance.
  • Photoresistor - Made from a light sensitive material that with more light there is less resistance.
  • Thermoresistor - Made from temperature sensitive material that alters the resistance dependant on the temperature.
  • Variable resistor - Often call potentiometer are used to adjust the resistance during use. There are also ones called trimmers, which are 'set and forget' you set the resistance with as screwdriver once or twice at the beginning and leave it alone after that.


Resistors

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AuthorMessage
Anonymous
200		Shame on you guys!
Anonymous
200		i like men too
Anonymous
200		Shouldn't the voltage division equation be: Vout = Vin(R2/(R1+R2))???
Anonymous
200		why cant u idiots at the top of the messages just ask/answer questions?
Anonymous
200		me too ;)
Anonymous
200		i like men
Anonymous
200		Where are resistors used?
Anonymous
200		how stupid
Anonymous
200		mr franklin was a gayboy ?
he's my hero
Anonymous
200		oq eéoldopvjoijdo9l joefju fpedfcovg orfjgoirf[


Anonymous
200		i like resistors, they are cool like mr franklin whos actually a gayboy
Anonymous
200		What do the different colours of resistor the mean? (ie. blue resistor vs brown vs green)
soumikdandapat
1		explain the work of resistor.
Anonymous
200		http://www.kpsec.freeuk.com/components/resist.htm#real
saran.invincible
1		Generally vin is greater than vout,
but by thge above voltage division rule, it is quite the opposite how come?
Anonymous
200		resistor is used in ciruit to limit the current
Anonymous
200		Resistors Have no polarity; they can be installed either way, but often it is best to put them in all facing the same way so as to make reading them easier.
Anonymous
200		Do they need to be put in a circuit in a certain way (positive, negative)? if so, how do I tell what end from the other?
Anonymous
200		The answer to this is mainly to do with the tolorance on the resistors. If you have 10-20-30-40....1000, there is not much difference between 990 and 1000 and 990 is well within the tolorance of 1000. So they start with a even number and jump up by the tollorance. For example with 10% tollorance it starts at 10 and the goes 12 (2 = 10% of 10 times by 2), 15, 18, 22, 27, 33, 39, 47, 56, 68, 82 so all the ranges are covered evenly. So 10 cover 9,10,11 and 12 covers 11,12,13 and 15 covers 14,15,16 and so on.
Anonymous
200		Hey, Why do resistors have odd values like 47k and 56k, but not 50k? Wouldn't it be alot easier to keep them at rounded values?
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