Resistor values in a simple parallel circuit

[Stuartambient]

This was just a simple learning circuit with 3 resistors in parallel connected to a 6V lantern battery. Wires were checked for accuracy compare to diagram. The only thing is the experiment called for values between 1K and 100K but we had a 1K, a 220 Ohm and a 470K in the circuit.  I didn't think it mattered but as soon as it was connected to battery the 220 started smoking.  So I'm wondering if the reason for 1k-100K values were necessary for some kind of compatibility?

I wound up replacing the 470K with a 22K and the circuit worked. Maybe it was just a bad resistor.

Edit: Sorry, I am enlarging the diagram but when attaching it doesn't seem to enlarge.

[rstofer]

Power in Watts = Voltage Squared divided by Resistance
P = 36 / 220 or 0.16 Watts - somewhat more than an 1/8th Watt resistor could handle.
What wattage resistor did you use?

[Stuartambient]

Power in Watts = Voltage Squared divided by Resistance
P = 36 / 220 or 0.16 Watts - somewhat more than an 1/8th Watt resistor could handle.
What wattage resistor did you use?

Ooops, sorry I left that out, but 1/4 Watt resistors.

[Audioguru]

I think your 220 ohms resistor was actually 22 ohms. Then it dissipated 6V squared/22 ohms= 1.64W.
The color stripes on cheap resistors makes brown and black look the same, and red and orange, and blue and green.

The resistors are in parallel so are each is connected to the same battery. Their resistances do not affect each other.

[rstofer]

I have completely given up on color codes.  Between dubious colors on the device and a defect in color vision, I decided long ago to just use a meter.  Always!

[Stuartambient]

I think your 220 ohms resistor was actually 22 ohms. Then it dissipated 6V squared/22 ohms= 1.64W.
The color stripes on cheap resistors makes brown and black look the same, and red and orange, and blue and green.

The resistors are in parallel so are each is connected to the same battery. Their resistances do not affect each other.

I think that makes the most sense.  My son was measuring so it's possible we didn't write down the correct range.  However it's a good reminder to do P calculations prior. 

[Stuartambient]

I have completely given up on color codes.  Between dubious colors on the device and a defect in color vision, I decided long ago to just use a meter.  Always!

Agree with using the meter.  I'm blind as a bat  so it requires a magnifying glass for me. Just easier to grab the meter.

[Zero999]

Edit: Sorry, I am enlarging the diagram but when attaching it doesn't seem to enlarge.

Because you didn't enlarge the actual image. All you did was put a lot of blank space around it. I've cropped it and shrunk it and it looks better.

The tiny image below the post, is just a preview. Click on it to see the full-sized image.

[Stuartambient]

Edit: Sorry, I am enlarging the diagram but when attaching it doesn't seem to enlarge.

Because you didn't enlarge the actual image. All you did was put a lot of blank space around it. I've cropped it and shrunk it and it looks better.

The tiny image below the post, is just a preview. Click on it to see the full-sized image.

Maybe it was my screen but it appeared in my edited (MS Paint) that it was enlarging.  I should have cropped.  Thanks!

[karoru]

Power in Watts = Voltage Squared divided by Resistance
P = 36 / 220 or 0.16 Watts - somewhat more than an 1/8th Watt resistor could handle.
What wattage resistor did you use?

If 1/8 W THT resistor started smoke emission after exceeding its power rating by 35 mW for few minutes (especially in thermally nice environment like single element on breadboard) I'd probably reconsider getting any more parts from that supplier/manufacturer.

[Stuartambient]

Power in Watts = Voltage Squared divided by Resistance
P = 36 / 220 or 0.16 Watts - somewhat more than an 1/8th Watt resistor could handle.
What wattage resistor did you use?

If 1/8 W THT resistor started smoke emission after exceeding its power rating by 35 mW for few minutes (especially in thermally nice environment like single element on breadboard) I'd probably reconsider getting any more parts from that supplier/manufacturer.

I think we figured out here that it was in fact a 22 Ohm, not 220 as originally intended.  Put it at 1.66 Watts on 1/4 watt. 

[karoru]

I think we figured out here that it was in fact a 22 Ohm, not 220 as originally intended.  Put it at 1.66 Watts on 1/4 watt.

Fair enough:) I was considering original reasoning and math, to be clear, so author of thread wouldn't think that this kind of overload will kill any resistor instantly with bonus fireworks.

[Stuartambient]

Fair enough:) I was considering original reasoning and math, to be clear, so author of thread wouldn't think that this kind of overload will kill any resistor instantly with bonus fireworks.

I appreciate it. The resistors were cheap (Banggood's) but for playing around they are fine.  Smoking resistors are alright. Added a little excitement to the experiment.  Exploding caps might not be so good 

[Brumby]

You haven't really been properly initiated if you haven't let out some of that magic smoke.... 

[Stuartambient]

You haven't really been properly initiated if you haven't let out some of that magic smoke.... 

Which component gives off the best fireworks without starting a fire, at least before I can react?

[karoru]

It depends how good are you with atypical odors.

[alsetalokin4017]

You haven't really been properly initiated if you haven't let out some of that magic smoke.... 

Which component gives off the best fireworks without starting a fire, at least before I can react?

Small electrolytic capacitors can explode like little rockets, ejecting the innards in a long ribbon. You don't want to be standing right over the top of one when it goes!
Tantalum caps explode nicely too, as do mosfets.

[Brumby]

I had a MOV across the mains fail once.

That was .... 'exciting'.