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1. Which type of electric current flows in one direction only and is used in galvanic electrotherapy devices?

Direct current (DC) is a constant, one-directional flow of electrons. Galvanic devices use DC because chemical reactions such as iontophoresis and desincrustation depend on a steady polarity.

2. Most salon hair dryers, clippers, and overhead lights plug into wall outlets that supply which type of current?

Standard United States wall outlets deliver alternating current (AC) at roughly 120 volts and 60 hertz. Salon equipment such as dryers and clippers is built to run on this AC supply.

3. A faradic current is best described as which of the following?

Faradic current is an interrupted or pulsating alternating current. Its short pulses cause visible muscle contractions, which is why it has historically been used for facial muscle toning.

4. During iontophoresis with a galvanic machine, a water-soluble product with a negative pH (acidic) is introduced under which electrode?

Like charges repel. An acidic, positively ionized product is pushed into the skin from the positive (anode) pole because the matching positive charge of the electrode repels the ions inward.

5. Desincrustation during a galvanic facial uses which polarity, and for what purpose?

Desincrustation uses the negative pole (cathode) with an alkaline solution. The chemical reaction at the negative electrode saponifies (softens) sebum and oily debris, making deep cleansing easier.

6. High-frequency (Tesla) current in a facial machine is primarily used to:

High-frequency (Tesla) current is a rapidly oscillating AC. It generates small amounts of ozone and gentle heat at the glass electrode, which has a mild antiseptic and stimulating effect on the skin.

7. Microcurrent devices used in facial services deliver:

Microcurrent is extremely low-amperage current measured in millionths of an ampere. It is typically sub-sensory and is used for gentle stimulation of facial tissue, not for strong muscle contractions or tissue destruction.

8. Infrared lamps used in salons primarily affect the skin by:

Infrared radiation lies just beyond visible red light. Its wavelengths are absorbed as heat, gently warming the skin, dilating surface vessels, and helping product penetration. It is not germicidal.

9. When using an infrared lamp on a client, the minimum safe distance is most commonly:

Infrared lamps must be kept far enough from the skin to avoid burns. Manufacturer instructions and standard practice place the lamp roughly 18 to 30 inches from the treatment area, and the practitioner should always confirm the client feels gentle warmth, not pain.

10. Ultraviolet (UV) radiation in a salon setting:

Short-wavelength UV light has germicidal properties but causes eye injury and skin burns with even short exposure. UV cabinets are storage aids only and do not replace EPA-registered disinfectants for tools.

11. A GFCI (ground-fault circuit interrupter) outlet is required by code in salon areas where water and electricity may meet. Its main purpose is to:

A GFCI compares current going out on the hot wire with current returning on the neutral. If even a small imbalance (around 5 milliamperes) flows to ground — for example, through a person standing in water — the device trips within milliseconds, sharply reducing the risk of electrocution.

12. Plugging several high-wattage appliances (blow dryer, curling iron, steamer) into a single outlet through a power strip is dangerous because it can:

Each circuit is rated for a maximum continuous load (often 15 or 20 amperes). Stacking high-draw appliances on one circuit through a power strip exceeds that rating, overheats the conductors, and is a common cause of electrical fires in salons.

13. You notice that the cord on a clipper has cracked insulation and exposed copper wire. The correct action is to:

A damaged cord can cause shock, burns, or fire. Industry safe practice and Cal/OSHA general electrical safety rules require removing damaged electrical equipment from service until properly repaired.

14. Why is a three-prong grounded plug safer than a two-prong plug on salon equipment with a metal housing?

Grounding gives stray current a safe, low-resistance path to earth. If a wire inside the appliance contacts the metal case, the fault current trips the breaker through the ground wire rather than passing through the person holding the appliance.

15. After each client, hand-held metal electrodes from a galvanic or high-frequency machine should be:

Reusable tools that touch the client must be cleaned and then disinfected between clients. The manufacturer's directions specify the correct method and approved disinfectant for the electrode material.

16. Under California Board rules for equipment sanitation, non-electrical multiuse implements (combs, shears, clipper guards) must be:

California Board sanitation rules require non-electrical multiuse tools to be cleaned of visible debris and then disinfected by full immersion in an EPA-registered hospital disinfectant for the contact time on the label. UV cabinets are not disinfection.

17. Electrical tools that cannot be fully immersed (such as clippers and trimmers) must be sanitized between clients by:

California Board rules and manufacturer instructions require that electrical tools be cleared of debris and that the blades and other client-contact surfaces be disinfected with an EPA-registered disinfectant. The motor housing is never immersed in liquid.

18. Within California's scope of practice, a licensed esthetician using electrotherapy in a facial may use which device?

California estheticians work on the superficial skin only. They may use non-medical galvanic, high-frequency, and microcurrent devices for facial care. Ablative lasers and needle electrolysis fall outside the esthetics scope of practice.

19. Before placing a client on a galvanic facial treatment, which of the following is a standard contraindication you should screen for?

Electrical current from galvanic, high-frequency, and microcurrent devices can interfere with pacemakers and other implanted electronic medical devices, and is also generally contraindicated in pregnancy, epilepsy, and on broken skin. The client should be screened before treatment.

20. If an electrical appliance falls into a sink or shampoo bowl of water while plugged in, the first action should be to:

Water is an excellent conductor of electricity. Reaching into water that may be electrified can cause electrocution. The safe response is to remove the power source first — flip the circuit breaker or unplug the cord at the outlet — and only then handle the device.

21. A salon device is rated 1500 watts and is plugged into a standard 120-volt circuit. Approximately how many amperes does it draw, and why does this matter for safety?

Amperage equals watts divided by volts (Ohm's law applied to power: I = P/V). 1500 W divided by 120 V equals 12.5 A, which is very close to the 15 A breaker rating common in salon receptacles. Plugging a second high-wattage appliance into the same circuit will trip the breaker or, worse, overheat the wiring before the breaker trips, creating a fire risk behind the wall. California licensees are required under CCR Title 16 §979 to maintain equipment in safe working order and to follow manufacturer load instructions. Option A and B undercount the math. Option D confuses watts with amps and is off by an order of magnitude.

22. Which statement most accurately describes a conductor versus an insulator in the context of salon electrical safety?

A conductor is a material through which electric current flows readily; an insulator resists current flow. Copper wiring carries current in tools; water and the moist human body conduct electricity, which is exactly why GFCI protection is required where water and electricity meet. Rubber, dry wood, glass, and silk insulate, which is why tool handles are rubber and the technician should stand on a dry floor. California regulates safe equipment use under CCR Title 16 §979.2. Option A reverses the categories. Option C is the opposite of physical reality. Option D treats conductivity as binary; it is a continuum and copper is the practical workhorse conductor.

23. A salon outlet is wired through a GFCI device. The GFCI compares which two measurements and trips when they differ?

A ground-fault circuit interrupter continuously compares the current leaving on the hot wire with the current returning on the neutral wire. In a healthy circuit they are equal. When even a few milliamps (typically 4 to 6 mA) of current leaks elsewhere, for example through a person standing in water, the GFCI senses the imbalance and trips within milliseconds, well before the current is sufficient to stop a heart. California requires GFCI protection at receptacles near water sources, consistent with CCR Title 16 §979.2 and the National Electrical Code. The other options describe measurements the GFCI does not perform.

24. A licensee notices that a curling iron's plug becomes very hot to the touch after only a few minutes of use, even though the iron itself is working. The correct response is to:

A plug that becomes very hot indicates a poor electrical connection, frayed wiring, or a damaged outlet, any of which is a fire hazard. The professional response is to tag the device out of service and remove it from use until it is repaired by a qualified person or replaced. California licensees are required under CCR Title 16 §979.2 to maintain equipment in safe operating condition. Option A continues the hazard. Option B introduces water near electricity and creates an immediate shock risk. Option C masks the symptom and accelerates the failure, possibly arcing inside the wall.

25. When unplugging a hair dryer from the wall, the correct method is to:

Pulling on the cord rather than the plug stresses the wire-to-prong solder joints inside the plug, eventually loosening them. Loose internal connections create arcing, overheating, and the kind of brittle, cracked plug that ignites lint. The correct technique is to grasp the molded plug body and pull straight out, perpendicular to the wall. California licensees are required to keep equipment in safe condition under CCR Title 16 §979.2, and cord care is part of that duty. Option A guarantees cord damage. Option C wrenches the prongs and damages the outlet. Option D leaves the device energized at the cord and plug, which is unsafe storage.

26. A licensed esthetician wants to perform a direct-application high-frequency facial. Which client condition is an ABSOLUTE contraindication that prohibits the treatment?

High-frequency current uses an oscillating alternating current that produces a small electromagnetic field at the electrode. That field can interfere with implanted cardiac pacemakers and other electronic medical devices, so a pacemaker is an absolute contraindication for high-frequency, galvanic, and microcurrent services. California estheticians performing electrotherapy must screen for this on the consultation form, consistent with the safe-equipment-use duties of CCR Title 16 §979.2. Pregnancy, metal implants in the treatment area, epilepsy, and severe heart disease are additional contraindications. Options B, C, and D are not contraindications; they describe ordinary client conditions.

27. Microcurrent facial devices deliver current measured in:

Microcurrent, as its name suggests, is delivered in MICROamperes, on the order of millionths of an ampere. The level is so low that most clients feel only a faint metallic taste from electrodes near the mouth, not muscle contraction. The current is thought to influence the resting bioelectrical state of facial tissue without forcing visible contractions, in contrast to faradic current, which deliberately contracts muscle. California electrotherapy use sits under CCR Title 16 §979.2 and the BBC's scope rules. Option A confuses microcurrent with faradic. Option B confuses it with high-frequency. Option D is physically impossible and is not a real device specification.

28. A licensee plans to use a steamer and an LED facial panel simultaneously on the same client. The two devices must be plugged into:

Facial steamers heat water and draw substantial current; LED panels typically draw less but still add to the load. Combining them on one circuit, especially via a daisy-chained power strip, risks tripping the breaker or overheating the wiring. The safe practice is to plug them into separate circuits, and the wet-area device must be GFCI-protected per California salon electrical practice referenced under CCR Title 16 §979.2 and the National Electrical Code adopted by reference. Option A creates a fire risk and is explicitly discouraged by manufacturers. Option C minimizes the actual steamer load. Option D is the opposite of safety practice; grounding is required, not optional.

29. Which statement about the relationship between volts (V), amperes (A), and watts (W) is correct?

The power equation states that power in watts equals voltage in volts multiplied by current in amperes, so W = V x A. This is why a 1500 W appliance on a 120 V circuit draws 12.5 A, and why the same 1500 W on a 240 V circuit would draw only 6.25 A. Understanding the formula prevents overloaded circuits in the salon, an issue addressed by safe equipment use under CCR Title 16 §979.2. Option A and B rearrange the variables incorrectly. Option C divides where multiplication is required and is the formula that fails on every electrical exam item.

30. An extension cord rated for 13 A is used to power a 1500 W flat iron. What is the safest practice?

A 1500 W flat iron on a 120 V circuit draws roughly 12.5 A, putting a 13 A extension cord right at its limit; small additional resistance in the connectors will push current past the cord rating, heating the cord. Extension cords are not intended for permanent salon use with high-wattage heat appliances, and California licensees must keep equipment safe per CCR Title 16 §979.2. The right answer is to plug the iron directly into a properly rated wall outlet. Tightly coiling holds in heat and accelerates insulation breakdown. Running cord under a rug hides damage and traps heat. Bundling multiple appliances on one cord multiplies the load and is a common cause of salon fires.

31. An esthetician's intake form must screen for electrotherapy contraindications. Which set of CLIENT FACTORS is an ABSOLUTE contraindication for high-frequency, galvanic, OR microcurrent electrotherapy?

The standard intake screen for electrotherapy lists implanted electronic medical devices (pacemakers, ICDs, neurostimulators) as absolute contraindications because the device may be disrupted by the salon device's electromagnetic field. Pregnancy is generally contraindicated for galvanic current (iontophoresis is poorly studied in pregnancy) and microcurrent. Metal implants in the treatment area concentrate current. Epilepsy and severe heart disease are also screened out. California licensees must comply with safe equipment use under CCR Title 16 §979.2 and screen for these factors before energizing any client. Options B, C, and D are not medical contraindications and reflect ordinary client activities or characteristics.

32. A salon flat iron is rated 60 watts, a salon hair dryer is rated 1875 watts, and a curling iron is rated 90 watts. Which statement BEST describes their load on a standard 120 V salon circuit?

Apply I = P / V (Ohm's-law power form). 1875 W / 120 V = 15.6 A, which is at or above a typical 15 A salon breaker rating; this means a salon hair dryer alone effectively saturates one circuit and should NOT share that circuit with another heat appliance. The 60 W flat iron draws 0.5 A and the 90 W curling iron draws 0.75 A. The dryer is by far the largest electrical load in the salon and is the single most common cause of nuisance breaker trips and cord overheating. California safe-equipment-use is at CCR Title 16 §979.2. Options A, C, and D contradict the basic math.

33. A 'transformer' attached to a salon device's power cord (the rectangular block in the plug) generally functions to:

Small consumer/professional devices often need a much lower voltage (5, 9, 12, 24 V DC) than the 120 V AC that comes out of the wall. The 'wall-wart' or in-line block contains a small step-DOWN transformer plus rectifier and filter circuitry that converts the 120 V AC down to the device's required low voltage DC. The transformer also provides galvanic isolation between the household mains and the user-facing low-voltage side, which improves safety. It does NOT replace a GFCI (option D), step voltage up (option A), or do anything to the air (option B). Equipment safety is required under CCR Title 16 §979.2.

34. GFCI receptacles are required by code within roughly 6 feet of a water source (shampoo bowl, manicure soak, pedicure basin) in salons. The PRIMARY reason is:

Water and the wet human body are both conductors. If an energized appliance falls into a shampoo bowl or pedicure tub, or if a person touches an energized component while standing in water, a current path opens through the person to ground. A GFCI continuously compares the current on the hot wire to the current returning on the neutral wire; an imbalance of just a few milliamps (4 to 6 mA) signals leakage to ground (a person) and trips the receptacle in milliseconds, well before the current is sufficient to stop a heart. This is why the National Electrical Code and California salon practice require GFCI protection within roughly 6 feet of water sources, consistent with CCR Title 16 §979.2 safe-equipment-use duties.