Cosmetology Test Electricity and Light Therapy 1 — Questions and Answers
Question 1: Which type of electrical current flows in only one direction and is used in galvanic treatments?
- Alternating current (AC)
- Direct current (DC) (Correct answer)
- Faradic current
- Sinusoidal current
Correct answer: Direct current (DC)
Direct current (DC) flows in one direction only, which is why it is used in galvanic facial treatments that rely on a consistent polarity.
Question 2: What unit is used to measure electrical resistance in a circuit?
- Volt
- Ampere
- Ohm (Correct answer)
- Watt
Correct answer: Ohm
Electrical resistance is measured in ohms, named after physicist Georg Simon Ohm who developed the foundational law of electrical circuits.
Question 3: Which safety device is designed to break a circuit by melting when too much current flows through it?
- Rheostat
- Conductor
- Fuse (Correct answer)
- Insulator
Correct answer: Fuse
A fuse is a safety device containing a metal wire that melts and breaks the circuit when current exceeds a safe level, preventing fires and equipment damage.
Question 4: What does electrical grounding provide in salon electrical safety?
- A boost in voltage to power equipment
- A safe path for excess electrical current to discharge into the earth (Correct answer)
- Insulation around wiring to prevent shock
- A way to measure voltage in a circuit
Correct answer: A safe path for excess electrical current to discharge into the earth
Grounding provides a safe pathway for stray or excess electrical current to discharge harmlessly into the earth, protecting clients and cosmetologists from electric shock.
Question 5: In cosmetology, galvanic current is primarily used for which two facial services?
- Hair removal and skin toning
- Iontophoresis and desincrustation (Correct answer)
- Sterilization and UV therapy
- Microdermabrasion and dermaplaning
Correct answer: Iontophoresis and desincrustation
Galvanic current powers iontophoresis (driving ionic products into the skin) and desincrustation (using alkaline reaction to dissolve sebum and debris in pores).
Question 6: What is the function of a rheostat in cosmetology electrical equipment?
- To convert alternating current to direct current
- To regulate or vary the strength of electrical current (Correct answer)
- To store an electrical charge for later release
- To measure the resistance of a circuit
Correct answer: To regulate or vary the strength of electrical current
A rheostat is a variable resistor used to adjust or regulate the intensity of electrical current flowing through equipment during treatments.
Question 7: Which type of electrical current do high-frequency machines use to produce their warming and germicidal effects?
- Direct current (DC)
- Galvanic current
- Alternating current (AC) (Correct answer)
- Faradic current
Correct answer: Alternating current (AC)
High-frequency machines use alternating current (AC) oscillating at a very high frequency, which creates a warming effect and produces ozone with germicidal properties.
Cosmetology Test Electricity and Light Therapy 1
Which type of electrical current flows in only one direction and is used in galvanic treatments?