Two 1200W hair dryers on a 120V circuit with a 20A breaker would ...

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Prepare for the PMMI Industrial Electricity Test with quizzes featuring flashcards and multiple-choice questions. Each answer is explained with hints to ensure a thorough understanding. Gear up to excel in your exam!

Multiple Choice

Two 1200W hair dryers on a 120V circuit with a 20A breaker would ...

Explanation:
When you want to know how much current a device draws on a 120V circuit, use I = P / V. A hair dryer rated at 1200W will draw about 1200 / 120 = 10 A during operation. If you run two of them on the same 120V circuit, their currents add, giving roughly 20 A total. A 20 A breaker is set to trip if the current exceeds its rating, but at normal operation you’re just at the limit, not necessarily tripping. So the setup would draw approximately 20 A; the breaker would stay closed unless a surge or voltage variation pushes current over the limit.

When you want to know how much current a device draws on a 120V circuit, use I = P / V. A hair dryer rated at 1200W will draw about 1200 / 120 = 10 A during operation. If you run two of them on the same 120V circuit, their currents add, giving roughly 20 A total. A 20 A breaker is set to trip if the current exceeds its rating, but at normal operation you’re just at the limit, not necessarily tripping. So the setup would draw approximately 20 A; the breaker would stay closed unless a surge or voltage variation pushes current over the limit.

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