I don't get it. WTF am I doing wrong?

[MidnighToker]

OK, now you guys are just TRYING to get me stick my fingers in my ears and scream "LA LA LA LA LA LA LA LA!!!!"



Still keep forgetting to measure with full batts, but with the 2W 2 ohm resistor, the thing works like a champ and lasts all day with heavy vaping.

 

[kinabaloo]

OK, now you guys are just TRYING to get me stick my fingers in my ears and scream "LA LA LA LA LA LA LA LA!!!!"

All one needs to know is: Use a 2ohm resistor with two lithiums to get about 5v at the atty.

 

[VaporX]

be sure to check your wattage on the resistors

if they get hot but you have the right voltage add another resistor(same ohm) or higher wattage of same omhs

 

[mnealtx]

In parallel...

 

[kinabaloo]

Use a higher wattage resistor. Otherwise you'd need 4 x 2ohm resistors arranged with two parallel pairs of two in series! Just up the power rating if needed. You need at least a 2w rating. I hope you're not using a 1/4w one!

 

[mnealtx]

Wattage in a parallel circuit is additive, I believe - in such case, two 2 watt resistors in parallel would equal a single 4w resistor.

 

[joedirt]

Wattage in a parallel circuit is additive, I believe - in such case, two 2 watt resistors in parallel would equal a single 4w resistor.

Well, you would put two 4 ohm / 1W in parallel to get an equivalent 2 ohm /2W resistor. (Each one sees 1/2 the current and power I^2*R is (1/4)*(2) )

At any rate, you don't need over 1W probably. Don't forget this ceramic resistors heat pretty slowly, so the wattage is the average power to them and since you only applying current for 6s on at a time then more then 6s off, if you are putting 2W while on, you only need to meet the power rating for 1/2 or 1/4 that.

 

[kinabaloo]

Well, you would put two 4 ohm / 1W in parallel to get an equivalent 2 ohm /2W resistor. (Each one sees 1/2 the current and power I^2*R is (1/4)*(2) )

At any rate, you don't need over 1W probably. Don't forget this ceramic resistors heat pretty slowly, so the wattage is the average power to them and since you only applying current for 6s on at a time then more then 6s off, if you are putting 2W while on, you only need to meet the power rating for 1/2 or 1/4 that.

Indeed, I agree.

 

[mnealtx]

That's a good point, Joe - I hadn't thought of that.