A device draws 8 A at 9 V. What is its power?

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Prepare for the Abeka Science Matter and Energy Test 7. Utilize flashcards and multiple choice questions with detailed explanations to boost your comprehension and succeed in your exam!

Multiple Choice

A device draws 8 A at 9 V. What is its power?

Explanation:
Power is found by multiplying voltage by current. With 9 volts and 8 amperes, P = V × I = 9 × 8 = 72, so the power is 72 W. The other numbers don’t fit the given values: 17 W would need about 1.89 A at 9 V, 9 W would need 1 A at 9 V, and 72 kW would require about 8,000 A at 9 V. In this setup, the device actually uses 72 W (which is 0.072 kW).

Power is found by multiplying voltage by current. With 9 volts and 8 amperes, P = V × I = 9 × 8 = 72, so the power is 72 W. The other numbers don’t fit the given values: 17 W would need about 1.89 A at 9 V, 9 W would need 1 A at 9 V, and 72 kW would require about 8,000 A at 9 V. In this setup, the device actually uses 72 W (which is 0.072 kW).

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