Physics Review Question Unit: Electricity and magnetism Year: 1995 Question#: 29 Question: Which unit is equivalent to a watt, the SI unit of power? (1 ) joule/second (2) joule/volt (3 ) joule/ohm (4 ) joule/coulomb What is this question really asking? Explanation by: Dana H [ Return to question menu ] Answer 1 joule/sec CORRECT Correct, The joule per second is eqivalent to a watt, the SI unit of power. This comes from the definition formula for power is P=W/t where W (work or energy) is measured in joules and t (time) is measured in seconds. return to top Answer 2 joule/ volt INCORRECT Incorrect, a joule/ volt does not equal a watt. Consider the definition formula for Power P=W/t return to top Answer 3 joule/ohm INCORRECT Incorrect, an ohm is equal to resistance in SI units. Consider the definition formula for Power P=W/t return to top Answer 4 joule/coulomb INCORRECT Incorrect, a joule/coulomb equals a volt not a watt. Consider the definition formula for Power P=W/t return to top What's this question really asking? What is a watt? return to top |
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