I am doing a project for GCSE creating a circuit board. i dont know what these things mean and what they do. Please help, thanks.
-[2k2]- thats one, what is it and what does it do?
-[270k]- dont know what this is either and what it does
-[100k]- same with this
they look like that except they got a box around the writing, please can someone tell me what each does and what affect they could have on a circuit.
Thank you
I am doing a project for GCSE creating a circuit board. i dont know what these things mean and what they do. Please help, thanks.
-[2k2]- thats one, what is it and what does it do?
-[270k]- dont know what this is either and what it does
-[100k]- same with this
they look like that except they got a box around the writing, please can someone tell me what each does and what affect they could have on a circuit.
Thank you
These are all resistors. the numbers inside are the resistance. eg 2k2 =2200 ohms. (2.2k but people tend to put in the k where the decimal point is -> 2k2)
270k = 270,000 ohms
100k = 100,000 ohms
It depends on the circuit diagram. can you post it, or post a link to it?
Or try looking on goole for citcuit symbols. The symbol for a variable resistor is the same as the symbol for resistor, but it has a '3rd' leg, which is shown on the diagram as an arrow pointing to the middle of the resistor.
100k is a Variable Resistor, it's resistance can be altered by turning the shaft. It's resistance can be anything from 0 ohms to 100K ohms depending on the position of the shaft.
The symbol below that is a Light Dependant Resistor (LDR). It's resistance will vary depending on how much light (or dark) it is exposed to.
Thanks thats brilliant, just what i needed, one other thing the resistors in the circuit are in place to just limit the amount of current flowing to the next component right?
sorry for keeping on hasseling you, but this is something i really need to get my head around
Thanks thats brilliant, just what i needed, one other thing the resistors in the circuit are in place to just limit the amount of current flowing to the next component right?
sorry for keeping on hasseling you, but this is something i really need to get my head around
Right (for this circuit), except for the variable Resistor. The purpose of the VARIABLE resistor is to set the sensitivity of the circuit (ie, to alter the amount of light needed to turn on the LED)
Just one tip, You can get loads of information from Google Quite often it will come up with links that are aimed at 'newbies' so you may get an explanation that is easier to understand.
You can't go out and buy an 800R resistor, not easilly anyway (some non-standard values are made but they tend to be more expensive) you'd normally use an 820R resistor.