If a 230 V supply draws 20 A, what is the input power?

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Enhance your understanding of the fundamentals of electricity with the AMT General Exam. Study with multiple-choice questions crafted to improve your knowledge and confidence. Prepare effectively for your success!

Multiple Choice

If a 230 V supply draws 20 A, what is the input power?

Explanation:
Power in an electrical circuit equals voltage times current: P = V × I. With 230 V and 20 A, the input power is 230 × 20 = 4600 W, or 4.6 kW. The other numbers don’t fit because they would require different currents at the same voltage (for example, 460 W would need about 2 A, 23 kW would need about 100 A, and 46 kW would need about 200 A). So the value that matches 230 V and 20 A is 4.6 kW.

Power in an electrical circuit equals voltage times current: P = V × I. With 230 V and 20 A, the input power is 230 × 20 = 4600 W, or 4.6 kW. The other numbers don’t fit because they would require different currents at the same voltage (for example, 460 W would need about 2 A, 23 kW would need about 100 A, and 46 kW would need about 200 A). So the value that matches 230 V and 20 A is 4.6 kW.

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