Yeah, it can. The simplest heat sensor is a thermocouple which is just two lengths of wire but the two wires have to be made of different metals. The junction of the two wires is the sensor and the other two ends output voltage.
oh awesome!. well ive made the temperatore sensor kit with relay and display. its from jaycar electroincs here in autsralia. and i turned knob too far while calibrateing and now the thermocouple compensator is broken =\ totaly lame that u can brake it calibrateing
normally they waste a little bit of energy. like if u want to run a led on 12 volts and the led takes 3.3 volts , u need to waste 8.7 volts worth of energy. at 0.02 amps normally.
Thanks, I wish my teacher at school just showed it me like this instead he took hours when its just a 5 minute job. I showed the last bit to emphasize that resistors will get hot when used and very hot when abused... ;-)
The resistence would only be half if the resistors were the same value. If you had say a 10 ohm and a 40 ohm, add them together makes 50 ohm. You would expect the result to be 25 ohms, but as the resistors are not equal the actual reistence you would get is 8 ohms.
The same if you had more than 2 resistors, is you had 3 resistors in parallel, all 10 ohm, the result would be 3.33 ohm. The formula for working it out is on the drop down menu to the right :)
ok thats good and i hear capacitors work in the opposite way ,, But if i put capacitors in series would that increase the voltage rating of them whilst reducing the capacity ?
Yeah I have tried that but a 10 Ohm resistor already has two solderable leads on it and you can just the head off the match afterwards.....It works well with fireworks if you build a control box with kill switches and push buttons to set the match off.
Another way to do it is to get some 3v xmas lights and crush the glass off the top, put 12v through the bulb and it glows orange and burns out.
The red matches actually conduct by themselves so you can just put power either side of them too.
a resistor can be used as a heat sensor?
rroge5 2 years ago
Yeah, it can. The simplest heat sensor is a thermocouple which is just two lengths of wire but the two wires have to be made of different metals. The junction of the two wires is the sensor and the other two ends output voltage.
kubikop 2 years ago
oh awesome!. well ive made the temperatore sensor kit with relay and display. its from jaycar electroincs here in autsralia. and i turned knob too far while calibrateing and now the thermocouple compensator is broken =\ totaly lame that u can brake it calibrateing
rroge5 2 years ago
what do resisters do?
endlesstime41 2 years ago
normally they waste a little bit of energy. like if u want to run a led on 12 volts and the led takes 3.3 volts , u need to waste 8.7 volts worth of energy. at 0.02 amps normally.
rroge5 2 years ago
Nice presentation; a little unorthodox but maybe the world needs that.
Probewitch 2 years ago
Thanks, I wish my teacher at school just showed it me like this instead he took hours when its just a 5 minute job. I showed the last bit to emphasize that resistors will get hot when used and very hot when abused... ;-)
Play safe every one!!
kubikop 2 years ago
Wow I did not know that resistance would be 1/2 if they were put in parallel this explains alot! Excellent video.
marthale7 2 years ago
The resistence would only be half if the resistors were the same value. If you had say a 10 ohm and a 40 ohm, add them together makes 50 ohm. You would expect the result to be 25 ohms, but as the resistors are not equal the actual reistence you would get is 8 ohms.
The same if you had more than 2 resistors, is you had 3 resistors in parallel, all 10 ohm, the result would be 3.33 ohm. The formula for working it out is on the drop down menu to the right :)
elecbeg 2 years ago
was ment to say in the " more info " section that kubikop has very nicely supplied. Not the drop down menu :)
elecbeg 2 years ago
@ elecbeg:
Thats exactly right, I only used 10 Ohm resistor to make it nice and simple everyone...
kubikop 2 years ago
@marthale7:
Thanks...
kubikop 2 years ago
ok thats good and i hear capacitors work in the opposite way ,, But if i put capacitors in series would that increase the voltage rating of them whilst reducing the capacity ?
ZED74 2 years ago
The voltage rating would stay the same, but yes the capacity of them would reduce. But that would only work for AC, as capacitors block DC power.
elecbeg 2 years ago
But I am guessing a video on capacitors will be along shortly explaining everything.
Kubikop would be able to explain everything in the video far better than what can be said in text here :)
elecbeg 2 years ago
@elecbeg:
Yeah, I was thinking I would do a video on Capacitors next.
Maybe blow one up at the end from over voltage.... ;-)
kubikop 2 years ago
woops my bad, the voltage would increase. But the rest of the stuff I said is correct though.
elecbeg 2 years ago
Easy mistake to make mate, do not worry it turns us all around a bit now and again.....
kubikop 2 years ago
@ZED74:
Yes in series the voltage would double and the Capacitance would half if you used identical capacitors.
Look up 'Marx Generator' for High Voltage fun...
kubikop 2 years ago
A better way to create an ignition source is to use steel wool. Apply a current to a small piece of steel wool and it will ignite.
RupertsCrystals 2 years ago
Yeah I have tried that but a 10 Ohm resistor already has two solderable leads on it and you can just the head off the match afterwards.....It works well with fireworks if you build a control box with kill switches and push buttons to set the match off.
Another way to do it is to get some 3v xmas lights and crush the glass off the top, put 12v through the bulb and it glows orange and burns out.
The red matches actually conduct by themselves so you can just put power either side of them too.
kubikop 2 years ago
Did the resistor get hot and set the match off or is something else going on to cause it?
DigitalRM 2 years ago
The Resistor gets very hot and then the match flares up...
kubikop 2 years ago
weird but dont they make other types that dont have this effect?
30GB 2 years ago
Its new to me if they have resistors that are not effected by temperature. I think thats why you have working temperatures of electrical items.
kubikop 2 years ago
LOL... Shouldent have shown that last one, could be used for.....other things....
Can101276 2 years ago
You can remotely set off fire crackers of fireworks....
But I see your point......lol
kubikop 2 years ago