Watts, Amps, Ohms and Volts
We’ll now go into the concepts on how your vape works. We’ll know how the atomizer works just like water flows through a hose. If you’ve never built before, don’t let this keep you from starting. You don’t need to understand all that.
Let’s talk about the Dripper Atomizer (RDA) which has three posts. The center post connects to the positive side of the battery and the other posts connect to the negative side of the battery. Since most are only single-coil builds, you do not need to use the extra post. This is how it looks like in a diagram:
If we pour water into the funnel, a current of water flows through. Something similar happens when you turn on your vape. Instead of water, a current of electricity flows. Water flow, for example, could be measured in gallons per minute, but the electrical current is measured in amps. So when you say I = 2A, you’re saying that the current is flowing at a rate of 2 amps.
When current flows through the wire, it causes friction, and that friction is what generates the heat. Power is the rate that the current is converted to heat, and this is measured in watts. With the vape, voltage is electrical pressure. In simple terms, voltage pushes the current through the wire. When you raise the voltage, you’re raising the electrical pressure, so the current will increase, and the power will increase. The coil is actually brighter in 6V versus 3V. The contrast is a little high, but is more noticeable.
If we use a thinner hose, the water slows down. The same thing happens when you switch to a thinner wire. The current has a harder time flowing. In other words, there is more resistance against the current flow. And resistance is measured in Ohms. Basically, if you have a 28AWG and a 32AWG wire with the same length, the thinner 32AWG wire will have the higher resistance. Higher resistance translates to less current flow and less power. But what this also means is that you will need less of the thinner wire to get the same resistance as the thicker wire. Even though the resistance, power and current are all the same, the surface area, length and diameter of the wire is different, so it affects the vape differently.
What we just went over about the relationship between current, voltage and is known as Ohm’s Law. This is the equation:
Combined with the power equation, you can rearrange these to find the values you want. You do not need to memorize these equations to build as there are charts that you can use.