Question

question 1 of 5

which blow dryer motor will have a typical working life span that is longer than 1,200 hours? (select all that apply.)

select the correct response(s):
ac motors
dc motors
ec motors
pmdc motors

Explanation:

Analyze the question requirements

The question asks to identify which blow dryer motor types have a typical working life span longer than 1,200 hours. It is a "select all that apply" multiple-choice question.

Evaluate blow dryer motor types

In cosmetology and professional styling tools, different types of motors power blow dryers:

• DC motors (Direct Current): Typically lightweight and less expensive, but have a shorter life span, usually around 400 to 700 hours.
• AC motors (Alternating Current): Standard in professional salon dryers. They are heavier but much more durable, typically lasting around 1,200 to 1,500 hours.
• EC motors (Electronically Commutated / Brushless): The most modern, advanced motors. Because they do not use carbon brushes, they experience minimal wear and tear, resulting in an exceptionally long life span often exceeding 5,000 to 10,000 hours.
• PMDC motors (Permanent Magnet Direct Current): Similar to standard DC motors, typically lasting under 1,000 hours.

Match with the threshold

The threshold specified is "longer than 1,200 hours".

• AC motors typically last around 1,200 to 1,500 hours (meeting or exceeding the threshold).
• EC motors (brushless) last significantly longer than 1,200 hours (up to 10,000 hours).

Therefore, both AC motors and EC motors fit the criteria of having a typical working life span longer than 1,200 hours.

Answer:

• AC motors (Correct answer)
• DC motors
• EC motors (Correct answer)
• PMDC motors