%displayPrice% at %seller% The Lenovo B50 is a midrange all-in-one desktop PC that's made to keep even enthusiast-level users happy for a few years.
Energy is an amount, while power is a rate at which energy is used. Energy is measured in watt-hours (WÂ·h) or joules (J). Power is measured in watts (W) or joules per second (J/s). Watt-hours are like buckets, and watts are like buckets per hour. If you have 5 buckets of energy and you pour one bucket per hour, you'll be able to pour for 5 hours before you run out.
SI unit of work, energy and heat. One joule is the work done when a force of one newton moves its point of application one metre in the direction of the force. Symbol J. 1 erg= 10~7 J, 1 kW hr=3-6 x 106 J, 1 eV= 1-602 x 1019J, 1 calorie =4-18 J, 1 Btu=1055 J. See SI units and Appendices.