Higher ohms vs lower ohms vs battery usage

[freefour]

Ok got a question here that is kinda tickling my brain . Wife bought some 2.2 heads for her esmart , they were 1.9 ohms before . Now her batteries don't last as long . I have had the same result when going from 1.9 to 2.6 on some of my clearos . Rule of electronics was if a higher ohm would pull less on a power than a lower ohm as a lower ohm would pull more power , think of it as a lightbulb ....if you have a 100 watt and a 60 watt bulb hooked up to the same power supply , the 100 watt would pull more power because the filament would be thinner ( lower resistance ) and more power would be at work ( heat and light) . So wouldn't a high ohm coil pull less power from the battery? Like one lasting 3 hours at 1.9 ohm should last longer with a higher ohm coil ?

 

[Rickajho]

In (electrical) theory I agree with you. But in practice when you are dealing with the likes of a 320 mAh capacity E-Smart battery it gets harder to parse out what should happen versus the real world experience.

How much of a run time difference is she noticing?

 

[bluecat]

My guess..

At 3.7 volts what you say holds true. By using the formula on a 1.8O and 2.3O atty both amps and watts would decrease.

I am assuming your wife may be using a regulated device. Watts is the fixed instead of volts. If you plug 10 watts at both 1.8O and 2.3O, you will see amps go down but the voltage will increase. Next thing is whether the decrease in amperage offsets the increase in voltage.. that I have no clue.

Of course my math may be incorrect.

If she isn't using variable wattage, then I am puzzled.

 

[WattWick]

While you are running at lower watts with a higher resistance coil, you are also vaporizing less liquids in the same time frame. Which translates to less nicotine intake. Which may cause you to vape more to get your "fix". Or take longer puffs to get the same amount of vapor.

 

[tj99959]

Charge life is measured in mAh, so it's all about the Amperage draw, not the ohms or watts.

 

[freefour]

She is useing the esmart 320 Mah batteries that came with the kit. Runtime I would say about the same although might be a little longer.

 

[WattWick]

Charge life is measured in mAh, so it's all about the Amperage draw, not the ohms or watts.

Can't have watts without amps in them. That's like pancakes without bacon.

 

[Verb]

Charge life is measured in mAh, so it's all about the Amperage draw, not the ohms or watts.

 

[AzPlumber]

My guess is the PWM regulator is probably more efficient with one resistance over another.

 

[Baditude]

This topic is all about Ohm's Law. Ohm's Law for Dummies

Amperage draw is what drains a battery, not volts. Wattage is the measurement of resulting heat of the coil.

In this discussion, we are seeking the amp draw of the battery using two different ohm coils (resistance) but using the same temperature (power in watts) to heat those coils. The wattage and resistance values are fixed in the two examples below, the voltage and amperage drain will be the variables.

Using a low resistance coil at low voltage and then switching to a higher resistance coil at higher voltage, they should vape very similarly.

Ohm's Law Calculator

Keeping the coil heat (8 watts) the same for both coils, the following can be demonstrated to show that despite using higher voltage to fire a higher resistance coil, slightly less amps from the battery is consumed.

Using lower voltage to fire a lower resistance coil, slightly more amps from the battery is consumed. The difference in amp drain isn't much, but it can add up over time.

2.5 ohm coil (resistance)
8 watts (power)

4.5 volts/ 1.8 amps draw from battery


2.0 ohm coil (resistance)
8 watts (power)

4 volts/ 2 amps draw from battery

 

[USMCotaku]

Think of it like a hole in a bucket. The lower the resistance, the larger the hole....the water in the bucket would be the batteries charge. The bigger the hole the less resistance to the water flowing out, the faster the bucket will empty
Sent from my RM-820_nam_att_100 using Tapatalk

 

[tayone415]

Ok got a question here that is kinda tickling my brain . Wife bought some 2.2 heads for her esmart , they were 1.9 ohms before . Now her batteries don't last as long . I have had the same result when going from 1.9 to 2.6 on some of my clearos . Rule of electronics was if a higher ohm would pull less on a power than a lower ohm as a lower ohm would pull more power , think of it as a lightbulb ....if you have a 100 watt and a 60 watt bulb hooked up to the same power supply , the 100 watt would pull more power because the filament would be thinner ( lower resistance ) and more power would be at work ( heat and light) . So wouldn't a high ohm coil pull less power from the battery? Like one lasting 3 hours at 1.9 ohm should last longer with a higher ohm coil ?

Less resitance=more amps/More resistance=less amps if vaping for the exact same amount of time. With lower resistance the greater the amp draw and the faster the coil will heat up and vaporize the e juice, while a higher resistance coil will take longer to heat up and to get the same amount of vapor for a mouth or lung hit she would need to hold the firing button longer which could explain the worse battery life. Higher resistance coils in a tank will make it a tighter hit so she maybe having to hold the firing button a lot longer and trying to suck in the vapor a lot harder and more often if she's not getting the same vape she was satisfied with before.

 

[Dampmaskin]

I wrote a blog post about battery drain on regulated devices here: Battery drain

 

[TheRac25]

keep in mind a batteries mah rating is at a given discharge rate, typically on the order of 200ma, higher discharge rates will result in lower effective mah. so lower resistance has a non-linear "double edged" effect using more power and lowering the effective mah rating