Ohm’s Law and Microcurrent: The Simple Electrical Science Behind the Treatment
By Julia Hart The Electrical Facialist
When Dr Joe Ventura, founder of AXION, spoke about microcurrent, he often brought the conversation back to a simple principle: Ohm’s law. It is a useful reminder that microcurrent is electricity, and that understanding how it is delivered starts with understanding the relationship between voltage, current and resistance.
Ohm’s law in plain English
The formula is:
V = I × R
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V is voltage: the electrical push.
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I is current: the flow of electrical charge, measured in amperes (A). Microcurrent is measured in microamperes (µA).
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R is resistance: opposition to the flow of current, measured in ohms (Ω).
Rearranged, the formula is I = V ÷ R. In a simple circuit, if the voltage stays the same and resistance increases, less current flows. If resistance falls, more current can flow.
Think of voltage as the push behind water moving through a pipe, current as the flow, and resistance as a narrowing in the pipe. It is only an analogy, but it makes the relationship easier to picture.
Why does this matter in a microcurrent facial?
A microcurrent device sends a very small electrical current through a circuit that includes the device, electrodes, conductive medium and the skin-contact area. The skin’s electrical properties are not fixed. Hydration, the amount and type of conductive product, electrode size, pressure and placement can all affect the contact between the device and skin.
Skin is also more complex than a simple resistor. Ohm’s law is a useful starting model, but living skin is not a fixed ohmic resistor: its electrical properties vary with frequency and time. For pulsed or alternating signals, impedance is often a more accurate term than resistance. Research has measured changes in skin impedance with frequency and after current is applied.
This helps explain why good contact and the right conductive medium matter. It also explains why a device’s current setting, by itself, does not tell the whole story. The waveform, polarity, electrode arrangement and the way the device controls its output all matter too.
A constant-current device is designed to adjust its voltage to maintain a selected current as the skin-contact load changes, within its operating limits. Other device designs may behave differently, so it is important not to assume every microcurrent machine controls its output in the same way.
One principle, different professional systems
I use several professional microcurrent systems in clinic, including AXION, TAMA, Neurotris, Acuscope and Pinnacle. They do not all use the same waveform, programme or method of delivery. Ohm’s law applies to the electrical circuit behind every system, but it does not make their technologies interchangeable.
For me, Dr Ventura’s emphasis on Ohm’s law is a valuable common-sense starting point: ask what the device is delivering, how it manages the changing skin-contact conditions, and how its protocol is intended to be used. The formula explains the electrical relationship. It does not, on its own, prove how a particular microcurrent treatment will affect the skin.
The simple takeaway: voltage is the push, current is the flow, and resistance is what opposes that flow. In microcurrent, understanding all three helps us think more clearly about device output and skin contact.
For more on Dr Ventura and AXION’s place in microcurrent history, read The Tsunami Wave: Dr Thomas Wing’s Legacy in Facial Microcurrent.
