Salon Electrical Fundamentals

Currents, Safety & Electrotherapy

Electrical beauty equipment high frequency galvanic mac

Foundations | State Board Exam Aligned

Shear Genius Society Curriculum

Every tool you plug in

Uses Electricity

Understand it to use it safely.

Blow dryers • Flat irons • Clippers • UV lamps • Steamers • High-frequency devices

What You'll Learn

Define electricity and explain how it flows
Differentiate conductors from insulators
Compare direct current (DC) and alternating current (AC)
Explain volts, amps, watts, and ohms

What You'll Learn

continued

Identify electrical safety hazards in the salon
Describe the five electrotherapy modalities
Explain UV and light energy applications
Apply electrical safety rules for State Board success

SECTION 01

Electrical Basics

What Is Electricity • Conductors & Insulators • DC vs. AC • Circuits

What Is Electricity?

Electricity is the flow of electrons along a conductor.

Electrons are negatively charged particles inside atoms
When electrons move through a material, that movement is electric current
Current needs a complete path (circuit) to flow
An electric circuit has a source, conductor, and load (device)

Conductors vs. Insulators

CONDUCTORS

Allow electricity to flow through them

Copper — most common in wiring
Water — why wet hands are dangerous
Metals — aluminum, gold, silver
The human body — conducts current

INSULATORS

Block or resist the flow of electricity

Rubber — used on tool handles & cords
Plastic — outlet covers, tool casings
Glass — light bulb casings
Dry wood — does not conduct

Direct Current vs. Alternating Current

DIRECT CURRENT (DC)

Flows in ONE direction only
Produced by batteries & cells
Used in electrotherapy devices
Galvanic current is DC
Steady, constant flow

ALTERNATING CURRENT (AC)

Changes direction rapidly (back & forth)
Standard wall outlet power
60 cycles per second in the U.S.
Powers blow dryers, flat irons, clippers
Converted to DC by some devices

BOARD TIP: DC = batteries & electrotherapy | AC = wall outlets & salon tools

Electrical Measurements

THE FOUR KEY UNITS

VOLT (V)

Electrical pressure — pushes current through the wire

Think: water pressure in a hose

AMP (A)

Electrical flow — how much current is moving

Think: volume of water flowing through the hose

WATT (W)

Electrical power — how much work the current does

Volts x Amps = Watts

OHM (Ω)

Electrical resistance — how much a material resists flow

Insulators have high resistance; conductors have low

Electrical Circuits

A COMPLETE PATH FOR CURRENT

A circuit must be complete (unbroken) for electricity to flow.

Every circuit needs: a power source, a conductor, and a load
A switch opens or closes the circuit (on/off)
A broken circuit = no current flow = device stops working
Fuses and breakers intentionally break the circuit for safety

BOARD TIP: A fuse or circuit breaker = automatic safety switch that breaks the circuit!

SECTION 02

Electrical Equipment Safety

UL Listed • Grounding • GFCIs • Cord Care • Wet Hazards

UL Listed Equipment & Grounding

UL = Underwriters Laboratories — independent safety certification
Only use UL-listed electrical equipment in the salon
UL tests for fire, shock, and electrical hazards

Three-Prong Plugs & Grounding

Third prong = grounding prong — safely redirects stray current
NEVER remove or bypass the third prong
Grounding protects both you AND the client from shock

GFCI Protection

GROUND FAULT CIRCUIT INTERRUPTER

A GFCI detects current leaks and shuts off power in 1/40th of a second.

WHAT IT DOES

Monitors current flowing out vs. coming back — if they differ, it trips

WHERE REQUIRED

Near water — salon sinks, shampoo bowls, wet areas

WHY IT MATTERS

Prevents electrocution — especially in wet salon environments

HOW TO TEST

Press TEST button monthly — should click off. Press RESET to restore.

Common Electrical Hazards

WHAT TO AVOID IN THE SALON

Overloaded Circuits

Too many devices in one outlet — causes overheating and fire

Wet Hands + Electricity

Water is a conductor — NEVER touch plugs or switches with wet hands

Damaged Cords

Frayed, cracked, or exposed wires = shock and fire risk

Extension Cord Overuse

Temporary only — never a permanent salon solution

Yanking Cords

Pull by the PLUG, not the cord — prevents internal wire damage

Proper Cord Care

PROTECT YOUR EQUIPMENT & YOUR CLIENTS

Inspect cords before EVERY use — check for cracks, frays, exposed wires
Never wrap cords tightly around hot tools — heat weakens insulation
Allow tools to cool completely before storing
Keep cords away from water, heat sources, and sharp edges
Replace damaged cords immediately — do NOT tape them

SECTION 03

Electrotherapy in Beauty Services

Galvanic • Faradic • High Frequency • Sinusoidal • Microcurrent

What Is Electrotherapy?

Electrotherapy uses electrical current for therapeutic skin and muscle treatments.

Different currents produce different effects on the skin and body
Always check for contraindications before performing electrotherapy
The practitioner must understand polarity — positive (+) and negative (−)
Electrotherapy devices must be used according to manufacturer instructions

BOARD TIP: Know the 5 modalities — galvanic, faradic, high frequency, sinusoidal, microcurrent

Galvanic Current

DIRECT CURRENT (DC) — TWO KEY PROCESSES

DESINCRUSTATION

Negative pole (−) on the client

Softens and emulsifies oil and debris
Opens pores for deep cleansing
Uses an alkaline-based solution
Great for oily and congested skin

IONTOPHORESIS

Positive pole (+) on the client

Drives water-soluble products into the skin
Tightens and calms the skin
Decreases blood flow to the area
Used for product penetration & soothing

Faradic Current

ALTERNATING CURRENT — MUSCLE STIMULATION

Faradic current causes involuntary muscle contractions.

What It Does

Produces rhythmic muscle contractions — like a workout for facial muscles

Current Type

Interrupted alternating current (AC)

Applications

Lifting sagging muscles, toning facial contours, improving circulation

Sensation

Client feels a mild twitching or pulsing in the treated area

Key Fact

Does NOT produce chemical changes — purely mechanical stimulation

High Frequency Current

ALSO KNOWN AS TESLA CURRENT / VIOLET RAY

Current Type

High rate of oscillation — produces heat, not muscle contraction

Violet Electrode

Direct — glass electrode touches the skin. Treats acne, oily skin.

Mushroom Electrode

Used on larger facial areas — gentle germicidal effect

Sparking

Electrode held slightly off skin — kills bacteria on contact

Benefits

Increases circulation, improves product absorption, antibacterial

Sinusoidal Current

A smooth, alternating current that produces gentle muscle contractions.

Similar to faradic but with a smoother wave pattern
Less intense — more comfortable for the client
Used for muscle toning and relieving muscle pain
Stimulates blood and lymph circulation
Commonly used in body treatments

Microcurrent

THE NON-SURGICAL FACELIFT

Microcurrent uses extremely low-level electrical current to tone facial muscles.

Intensity

Measured in microamps — so gentle, clients usually cannot feel it

How It Works

Mimics the body's own bioelectrical current to re-educate muscles

Benefits

Lifts, firms, and tones — improves ATP production in cells

Applications

Facial toning, reducing fine lines, improving muscle definition

Sessions

Cumulative results — best with a series of treatments

Polarity Quick Reference

POSITIVE (+) vs. NEGATIVE (−)

NEGATIVE POLE (−)

Also called the CATHODE

Produces alkaline reaction
Softens and relaxes tissues
Opens pores (follicles)
Increases blood flow
Used in desincrustation

POSITIVE POLE (+)

Also called the ANODE

Produces acidic reaction
Firms and tightens tissues
Closes pores (follicles)
Decreases blood flow
Used in iontophoresis

SECTION 04

Light Energy & UV

Electromagnetic Spectrum • Visible Light • Infrared • Ultraviolet • UV/LED Lamps

The Electromagnetic Spectrum

ENERGY THAT TRAVELS IN WAVES

Light is a form of electromagnetic radiation — different wavelengths produce different effects.

VISIBLE LIGHT

The only part we can see — the rainbow of colors

INFRARED (IR)

Below visible — produces heat, used in thermal treatments

ULTRAVIOLET (UV)

Above visible — invisible rays with germicidal and curing properties

Visible Light & Infrared

Visible Light

White light contains all visible wavelengths
Red light — stimulates, warms, promotes healing
Blue light — calming, soothing, used for acne therapy

Infrared (IR)

Produces heat — penetrates deeper than visible light
Relaxes muscles, increases blood flow
Used in heat lamps and thermal therapy

Ultraviolet (UV) Rays

THREE TYPES — UV-A, UV-B, UV-C

UV-A

Longest wavelength — penetrates deepest into the skin

Used in UV nail lamps to cure gel polish • Causes skin aging with overexposure

UV-B

Medium wavelength — affects the outer skin layers

Causes sunburn with overexposure • Stimulates vitamin D production

UV-C

Shortest wavelength — strongest germicidal effect

Used in sanitizing equipment • Does NOT reach earth's surface naturally

UV & LED Lamps

GEL CURING IN NAIL SERVICES

UV LAMP

Cures all types of gel polish
Cure time: 2-3 minutes per coat
Bulbs must be replaced regularly

LED LAMP

Cures LED-specific gel polishes only
Cure time: 30-60 seconds per coat
Bulbs last much longer than UV lamps

UV Exposure Safety

Apply SPF to client hands before UV lamp exposure
Offer UV-protective gloves with fingertip openings
Do not overexpose — follow manufacturer cure times

SECTION 05

Safety Rules & Contraindications

Salon Safety • When NOT to Use Electrical Equipment • Client Screening

Salon Electrical Safety Rules

NON-NEGOTIABLE

Inspect ALL electrical equipment before each use
Disconnect appliances when not in use — don't leave them plugged in
Keep electrical cords off the floor to prevent tripping
Never touch electrical equipment with wet hands
Use only one plug per outlet — avoid outlet overload

If an electrical device sparks, smokes, or shocks — UNPLUG IT IMMEDIATELY. Do NOT use again.

Contraindications

WHEN NOT TO USE ELECTRICAL EQUIPMENT

Pacemaker or heart condition

Electrical current can interfere with cardiac devices

Seizure disorder / epilepsy

Electrical stimulation may trigger a seizure

Metal implants or pins

Metal conducts current — can cause burns or pain

Pregnancy

Electrical treatments are not proven safe during pregnancy

Broken or inflamed skin

Current on open wounds causes pain and infection risk

ALWAYS perform a client consultation BEFORE any electrotherapy service!

Electrical Formulas

KNOW THESE FOR THE EXAM

Watts = Volts × Amps

Power = Pressure × Flow

VOLTS

Pressure / Force
that pushes current

Like water
pressure

AMPS

Volume / Flow
of current moving

Like gallons
per minute

WATTS

Power / Work
produced by current

Volts x Amps
= Watts

Key Terms Review

PART 1

Conductor

Material that allows electricity to flow through it

Insulator

Material that resists or blocks electrical flow

Circuit

Complete path through which electrical current flows

GFCI

Device that shuts off power when it detects a current leak

Galvanic Current

Direct current used for desincrustation and iontophoresis

Key Terms Review

PART 2

High Frequency

Oscillating current used for germicidal and circulation benefits

Microcurrent

Low-level current that tones facial muscles and boosts cell energy

Volt

Unit of electrical pressure that pushes current

Amp

Unit measuring the flow/volume of electrical current

Watt

Unit of electrical power — Volts x Amps

Board Exam Tips

BASICS OF ELECTRICITY EDITION

DC = direct current (batteries, galvanic) | AC = alternating current (wall outlets)
Negative pole opens & softens | Positive pole closes & firms
GFCI = required near water in the salon — prevents electrocution
Watts = Volts x Amps — memorize this formula
Know ALL five electrotherapy modalities and what each one does

Q1

What type of current flows in ONE direction only?

A) Alternating current (AC)
B) Direct current (DC)
C) High frequency current
D) Sinusoidal current

Click to reveal answer

Q2

What does a GFCI protect against?

A) Overloaded circuits
B) Power surges
C) Electrocution near water
D) Short circuits

Click to reveal answer

Q3

Which galvanic process uses the NEGATIVE pole to soften and cleanse?

A) Iontophoresis
B) Microcurrent
C) Desincrustation
D) Cataphoresis

Click to reveal answer

Q4

What is the formula for electrical power?

A) Watts = Amps / Volts
B) Watts = Volts + Amps
C) Watts = Ohms x Volts
D) Watts = Volts x Amps

Click to reveal answer

Q5

High frequency current is also known as:

A) Galvanic current
B) Tesla current
C) Faradic current
D) Sinusoidal current

Click to reveal answer

Q6

Which UV ray is used in nail lamps to cure gel polish?

A) UV-B
B) UV-C
C) UV-A
D) Infrared

Click to reveal answer

Q7

Electrical treatments should NOT be performed on clients with:

A) Dry skin
B) Oily skin
C) A pacemaker
D) Short nails

Click to reveal answer

Q8

Which material is a CONDUCTOR of electricity?

A) Rubber
B) Glass
C) Plastic
D) Water

Click to reveal answer

Salon Electrical Fundamentals

Chapter Complete

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