Question
Download Solution PDFMatch the following with the correct response:
| List I | List II | ||
| 1. | W | A. | Nm |
| 2. | kW | B. | 3.6 × 106 J |
| 3. | 1 kW.h | C. | 1000 W |
| 4. | 1 HP | D. | 746 W |
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 1 - A, 2 - C, 3 - B, 4 - D
Key Points
- Work is when a body is displaced by a distance on applying force or work done by a force on an object is equal to the magnitude of a force multiplied by the distance moved in the direction of a force.
- Distance is represented by s and Force by F.
- So, Work (W) is given by W = F.s.
- SI unit of work is N-m or Joule and CGS unit is erg. 1 joule = 10 7 erg.
- Work is a scalar quantity i.e., it only has magnitude but not direction.
- Power is the rate of work done by the body and is given by
where the SI unit of power is a watt (W) or kW (1000 W). - It is also measured in Horsepower and 1 HP = 746 W.
- Work/Energy is measured in joule (J) and 1 kWh = 3.6x10 6 joule. Hence option 1 is correct.
- Horsepower (HP) is another SI unit of power. We generally calculate the power of an engine in HP.
Additional Information
- Some of the physical terms and their SI units are given below:
Electric current Ampere Temperature ºC or Kelvin (K) Luminous intensity Candela (Cd) Electric charge Coloumb Frequency Hertz (Hz)
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