WORK, ENERGY AND POWER

         WORK, ENERGY AND POWER

Work Work should be possible when a force creates a displacement. For example at the point when an individual ascensions the steps of an office or a house, work is supposed to be done as he is moving against the power of gravity. Essentially, Work done by a force relies on two variables: (I) Magnitude of the force (ii) Distance through which the body moves toward force. Accordingly, Work is estimated by the result of force and uprooting of the body along the bearing of force. It is a scalar quantity and its SI unit is joule. Work = Force X Distance (S) moved toward force Or on the other hand Work = F X S - If a body gets moved or displaced by S when a force F follows up on it, at that point Work W = F S Cos θ Where θ = angle between force and displacement Note: The condition for a force to take care of job is that it should create movement in an item, for example on the off chance that the distance moved is zero, and afterward the work done on an item is additionally zero. For instance, if a man pushes a wall, yet there is no removal that is wall is fixed it doesn't move, at that point, the work done by the man on the wall is zero. In any case, the work done on the body of the man himself isn't zero. Since while pushing the divider man devours energy, his muscles are extended and he feels tired. Likewise, we can take another model that if a man stops at a bus station with weighty bag in his grasp, he may get worn out soon however he accomplishes no work in the present circumstance since bag held by the man don't move by any means. Along these lines, it is clear now that at whatever point a force is applied to an object it isn't fundamental that work is finished. Work is done when force ready to move the item. What happens when work is done against gravity? At whatever point work is done against gravity, the measure of work done is equivalent to the result of weight of the body and the vertical distance through which the body is lifted. Work done in lifting a body = Weight of body x Vertical distance W = m x g x h Where W = work done m = mass of the body g = acceleration due to gravity h = height through which the body is lifted Energy Capacity to do work is called energy. Energy is a scalar quantity for example it has just magnitude yet no direction and its unit is joule. The energy needed to do 1 joule of work is called 1 joule energy. 1 Kilojoules (KJ) = 1000 joules (J) The unit joule is named after a British physicist James Prescott Joule. - Energy created by a body because of work done on it is called mechanical energy. It is of two sorts: (I) Potential Energy (ii) Kinetic Energy Power Power is characterized as the pace of tackling job. It is scalar amount. Power = Work done/time taken Or on the other hand P = W/t where P = Power W = work done t = time taken Additionally, when work is done, an equivalent measure of energy is consumed. Accordingly, power is additionally characterized as the rate at which energy is consumed or used. Power = Energy devoured/Time taken Or then again P = E/t where P = Power E = energy devoured t = time taken The S.I unit of power is watt (W). One watt is the power of a machine which tackles job at the pace of 1 joule for each second. 1 watt = 1 joule/1 second Or then again 1W = 1 J/1 s 1 watt = 1 joule for every second 1 KW = 1000 watt - Horse power is another unit of power which is equivalent to 746 watt for example 1 drive is equivalent to about 0.75 kilowatt (0.75 KW). 1 watt second = 1 watt x 1 second 1 watt hour (Wh) = 3600 joule 1 kilowatt hour (kWh) = 3.6 x 10 power 6 joule Conservation of Energy Energy can nor be made nor wrecked. No one but energy can be changed starting with one form then onto the next. At whatever point energy is used in one form, equivalent measure of energy is delivered in other form. Subsequently, absolute energy of the universe stays same.