So what are the watts, volts and amps all about? We have everything you need to know about electrical power (Watts), current (Amps) and voltage (Volts) and how to understand simple electricity and the way these parameters relate to one another in regards to vaping.


Electricity consists of the flow of electrons through a conductor such as an electric wire. You can’t see electrons but a helpful analogy is to think of electricity as the flow of water through a pipe. We measure the rate of flow of electricity as an electric current (just as we think of the rate of flow of water in a river as the river current). The letter used to represent current in an equation is I.

Electric current is measured in Amperes, shortened to Amps or simply the letterA.

A current of 2 Amps can be written as 2A. The bigger the current the more electricity is flowing.


Volts or voltage is the amount of potential energy that electrons have relative to another point, usually what's called "ground", which is defined as having a potential of 0 volts. In some devices, this is related to current by what's called resistance (measured in ohms), which is the ratio of voltage to current in said device. Specifically, voltage is the amount of energy per coulomb of charge, so volts have the dimension of Joules per Coulomb. So basically, they are the difference between the two sides of a circuit. Big difference = big volts.

Electricity at a high voltage will be pushed cross great air gaps. 'Static' electric charges are an example of this: they jump, but they won't kill you ordinarily. High voltage, low watts (milliwatts).


So how do current and voltage relate to one another? Well, the bigger the current the brighter the light and similarly the bigger the voltage the brighter the light. Both the voltage and the current in the bulb determine how much energy is released in a certain time.

The Watt is a measure of power or how much energy is released per second. It can be shortened to W.

1 Watt can be written 1W.

We can calculate the power released in a bulb by multiplying the voltage in Volts across the bulb by the current in Amps flowing through the bulb (W = V x I).

For example a current of 2 Amps flowing through a bulb with 12 Volts across it generates 24 watts of power.

In the UK, domestic power is supplied at 240 Volts. A 100 Watt bulb will therefore draw a current of 100/240 Amps (about 0.4A). This means a 1A fuse can be safely added to the mains plug of a desk lamp with a 100W bulb because 1A is much greater than 0.4A.

In the USA, the domestic supply is typically 110V, safer than the UK, and this means a 100W bulb draws a current of 100/110 Amps (about 0.9A).