LR versus SR and battery life (before next charge)

[vdrum4250]

ok here goes:

I was wondering of someone out there know electronics to help me out here with a question


Option A:

LR atomizer 1.6 ohm running at 4 volts is 2.5 amps with 10 watts power


Option B:

SR atomizer 3.0 ohm running at 5.5 volts is 1.8 amps with 10 watts power



which scenerio will give my 2000Mah more time before i need to recharge.


i am thinking that they produce the same amount of power but Option a is drawing more power faster so it might be depleting the battery faster.

Any brainiacs out there care to give me the correct scientific answer


I hear that LR dont last as long since more current is running through the wire than a SR and that LR is more for short draws of intense heat versus longer draws from SR.


I welcome opinions from all...

 

[Hoosier]

Given the parameters of the OP, option B will deplete a single battery quicker. For one it actually consumes 0.08 Watts more power and for another the efficiency of the boost circuit usually is worse as the output voltage delta increases. (The greater the difference between the input and output voltage, the lower the efficiency of the boosting circuit...typically.)

If it is a 2 battery setup using a buck circuit, it may be a wash, but my money is still on option B.

To simplify a voltage boost circuit, assume the difference between input and output voltage is created by current. So while your output (coil) current is lower, the input (battery) current is increased. To simplify a buck circuit, assume the voltage is reduced by reducing current. (These are gross simplifications and only apply to the types of circuits usually found in PV's as understanding what is really going on would require an understanding of DC electronics and non-linear components and that is a bit wordy to explain.)

I am assuming that you have a single cell boost circuit because I am assuming 2000 mAh refers to an 18650 IMR battery, but wanted to include something about buck circuits just incase I am assuming too much.