Here's how you calculate the total resistance of multiple coils (in a parallel circuit). They need not have the same resistance. Don't know why you'd want to install coils with different resistances but hey... It could happen if your coils have different diameter, are made of different wire, or if you have fewer wraps, obviously.
If the individual coils have resistances R1, R2, R3, ... then the total is
R = 1 / ( 1/R1 + 1/R2 + 1/R3 + ... )
In other words, you sum the reciprocals and finally take the inverse of that sum. Example: R1 = 1 Ohm, R2 = 2 Ohm, R3 = 3 Ohm gives R = 0.55 Ohm.
Note that the total R is always less than the lowest of the individual resistances. If they're all the same then the total is the resistance of any of the individual coils divided by the number of coils. If one of the coils has a much lower resistance than any of the other coils then the total R is close to that smallest resistance. If the wire of one of the coils pops, it's resistance is effectively infinite and it drops out of the equation; you could continue vaping on the remaining coils, the total R would increase somewhat. (A broken coil may risk a short though if the wire is not removed from the atomizer.)
The total current I = U / R = U/R1 + U/R2 + U/R3 + ... = I1 + I2 + I3 + ... is simply the sum of the currents through each of the coils (U is the voltage). So is the total power P = U * I = P1 + P2 + P3 + ...
Just be sure that the multi coil setup doesn't draw a current that exceeds your battery's capabilities. Happy vaping.
If the individual coils have resistances R1, R2, R3, ... then the total is
R = 1 / ( 1/R1 + 1/R2 + 1/R3 + ... )
In other words, you sum the reciprocals and finally take the inverse of that sum. Example: R1 = 1 Ohm, R2 = 2 Ohm, R3 = 3 Ohm gives R = 0.55 Ohm.
Note that the total R is always less than the lowest of the individual resistances. If they're all the same then the total is the resistance of any of the individual coils divided by the number of coils. If one of the coils has a much lower resistance than any of the other coils then the total R is close to that smallest resistance. If the wire of one of the coils pops, it's resistance is effectively infinite and it drops out of the equation; you could continue vaping on the remaining coils, the total R would increase somewhat. (A broken coil may risk a short though if the wire is not removed from the atomizer.)
The total current I = U / R = U/R1 + U/R2 + U/R3 + ... = I1 + I2 + I3 + ... is simply the sum of the currents through each of the coils (U is the voltage). So is the total power P = U * I = P1 + P2 + P3 + ...
Just be sure that the multi coil setup doesn't draw a current that exceeds your battery's capabilities. Happy vaping.
