A 3 horsepower, 100 V DC motor is 85%...

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Question 1 of 20eUa05HXYf0hC4LKCw2Pa

A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current?

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Question 1 of 20

eUa05HXYf0hC4LKCw2Pa

A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current?

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🔍 Key Concepts

• Horsepower to watts conversion (1 HP = 746 watts) to find the motor’s mechanical output power in watts • Efficiency = output power ÷ input power, so rearrange this to find how much electrical power must go in • Electrical power formula: P = V × I to connect power, voltage, and current

💭 Think About

• First convert 3 HP into watts so you have the mechanical output power in standard units • Use the 85% efficiency to figure out the electrical input power (it must be higher than the output power) • Once you know input power in watts and the voltage (100 V), solve P = V × I for current I

✅ Before You Answer

• Be sure you use output power ÷ efficiency to find the input power, not the other way around • Check that your final input power is larger than the 3 HP (in watts), since efficiency is less than 100% • After finding current, see which option is closest to Input power (W) ÷ 100 V and matches your units (amps)

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Question 1 of 20eUa05HXYf0hC4LKCw2Pa

A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current?

Back

Question 1 of 20

eUa05HXYf0hC4LKCw2Pa

A 3 horsepower, 100 V DC motor is 85% efficient when developing its rated output. What is the current?

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