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What is SR, LR and HR resistance.  

What is Normal Resistance, Low Resistance and High Resistance? what suitable voltage to different resistance?

What is Normal Resistance, Low Resistance and High Resistance? what suitable voltage to different resistance

To understand Standard(Normal) Resistance(SR),Low Resistance(LR) and High Resistance(HR/HV) of the e-cig atomizer/cartomizer/clearomizer/glassomizer, it helps to be familiar with Ohms Law.  
*Power (measured in watts) is the intensity of the vape. Unit of electrical energy or power - one watt is the product of one ampere and one volt - one ampere of current flowing under the force of one volt gives one watt of energy.
4-8 watts is the “sweet spot” for most vapers.
• Watts = Volts X Volts / Ohms

*Current (measured in amps) is what can burn out cartomizers. one ampere is the current which one volt can send through a resistance of one ohm. Roughly speaking: around 1.5 amps is fine; 2.0+ amps is risky.
•Amperes = Volts / Ohms

But watts and amps are not properties of cartomizers or batteries. They are derived from cartomizer resistance (measured in ohms) and battery voltage (measured, of course, in volts).

Voltage - unit of electrical potential or motive force - potential is required to send one ampere of current through one ohm of resistance, you can get this parameter from the battery.
Ohms - unit of resistance - one ohm is the resistance offered to the passage of one ampere when impelled by one volt, you can get this parameter from the e-cig atomizer (or cartomizer, clearomizer, glassomizer)
Low resistance generally refers to 1.8 Ohms-2.4 Ohms, the normal resistance refers to 2.8-3.2 Ohms, and High resistance refers 4.0+ Ohms.

So we need to balance battery voltage with cartomizer resistance to get an ideal vape intensity (4-8 watts or so) without burning out the cartomizer. If the voltage is too low and/or the cartomizer resistance is too high (relative to each other), the watts are low and you get a poor vape (little throat hit, vapor, and flavor). On the other hand, if the voltage is too high and/or the cartomizer resistance is too low, the amps are high and you can burn out the cartomizer.

If Watts< 4.0, too low to power the coils effectively but will not hurt to try it.

If 4.0<Watts< 8.0, Safe to vape, can give you decent vape.

If Watts>8.0, May damage or burn out your coils, not recommended.

Enter any two known values and press "Calculate" to solve for the others. For example, an eGo havng a rating of 3.7 volts AC and using a carto of 2.5ohms will draw 1.48 Amps and 5.476 watts. In normally, you can know the Voltage from the battery and the resistance from the cartomizer.

Voltage (E) = Current (I) * Resistance (R)
Power (watts) = Current Squared (I^2) * Resistance (R)
Power = I*E = E^2 / R

Volts (E)
Amps (I)
Ohms (R)
Power (Watts)
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