Chapter 4 Part 2: WORK AND ENERGY S. Chand Class 9 Solution.
Very Short Answer Type Questions 1. Name the commercial unit of measurement of energy. The commercial unit of measurement of energy is the kilowatt-hour (kWh). 2. Define kilowatt-hour. Kilowatt-hour is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h). 3. Name two units of power bigger than watt. Two units of power bigger than watt are kilowatt (kW) and megawatt (MW). 4. Define the term ‘watt’. A watt is the SI unit of power, defined as one joule per second (1 W = 1 J/s). It measures the rate of energy conversion or transfer. 5. How many watts equal one horse power ? One horsepower is equivalent to approximately 746 watts. 6. Name the physical quantity whose unit is watt. The physical quantity whose unit is watt is power. 7. What is the power of a body which is doing work at the rate of one joule per second ? The power of a body which is doing work at the rate of one joule per second is one wat 8. A body does 1200 joules of work in 2 minutes. Calcu...