If a load operates at 100 V and draws 3 A, what is the power in watts?

If a load operates at 100 V and draws 3 A, what is the power in watts?

• A. 60 W
• B. 3000 W
• C. 300 W
• D. 30 W

Answer: (C)

Power is the rate at which electrical energy is used or produced, and in DC circuits it’s found by multiplying voltage by current: P = V × I. With 100 volts and a current of 3 amperes, the power is 100 × 3 = 300 watts. That’s why the 300-watt choice is the correct one. The other numbers would require different current or voltage (for example, 60 W would need 0.6 A at 100 V, 3000 W would need 30 A, and 30 W would need 0.3 A).

Power is the rate at which electrical energy is used or produced, and in DC circuits it’s found by multiplying voltage by current: P = V × I. With 100 volts and a current of 3 amperes, the power is 100 × 3 = 300 watts. That’s why the 300-watt choice is the correct one. The other numbers would require different current or voltage (for example, 60 W would need 0.6 A at 100 V, 3000 W would need 30 A, and 30 W would need 0.3 A).