One watt is equal in value to__________________?
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Answer: A. 1 Nm/s
Explanation
One watt is defined scientifically as one joule of energy expended per second of time. Since a joule is equivalent to a newton-meter, a watt equals one newton-meter per second. Dimensional analysis confirms this fundamental relationship between power, force, distance, and time. Power measures the rate at which mechanical work is performed or energy is transferred. The SI unit of power is the watt, honoring inventor James Watt's contributions. Mechanical power calculations multiply force by velocity or torque by angular speed.
Electrical appliance ratings and mechanical motor outputs are specified in watts or kilowatts. Engineers use power units to calculate energy consumption rates in industrial machinery. Proper unit conversions ensure accuracy in dynamic mechanical power transmission calculations. Option B features a distance denominator squared, failing the correct power dimensions. Option C and D introduce hour time units instead of standard per-second SI definitions. Option E uses improper minute time units combined with incorrect spatial dimensions.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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