What is the line current of a 7 horsepower...

Question 1 / 20YJLDDBshQakPmTceLuJf

Question 1 of 20YJLDDBshQakPmTceLuJf

What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?

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Question 1 of 20

YJLDDBshQakPmTceLuJf

What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?

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🔍 Key Concepts

• Relationship between horsepower and watts (mechanical power to electrical power) • Single-phase power formula: P = V × I × pf × efficiency • Converting from output power to input current considering power factor and efficiency

💭 Think About

• First convert the motor's horsepower rating into watts of output power. What conversion factor do you use? • Once you have output watts, how do you adjust for 95% efficiency to find input electrical power? • Finally, how do you rearrange the single-phase power formula to solve for line current I, and which answer choice is closest to that value?

✅ Before You Answer

• Use the correct conversion: 1 hp ≈ 746 watts (mechanical output) • Remember to divide by both power factor (0.8) and efficiency (0.95) when solving for current, not multiply them. • After computing I, check if your result is in a realistic range for a 7 hp, 120 V motor (around tens of amps, not just a few amps).

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Question 1 of 20

What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?

4.72 amps.

13.03 amps.

56 amps.

57 . 2 amps.

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Question 1 / 20YJLDDBshQakPmTceLuJf

Question 1 of 20YJLDDBshQakPmTceLuJf

What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?

Back

Question 1 of 20

YJLDDBshQakPmTceLuJf

What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed