Page 1 : Quantity Unit Symbol, Temperature kelvin K, Length metre m, Mass kilogram kg, Weight newton N, Volume cubic metre ms, Density kilogram per cubic metre kg m3, Pressure pascal Pa, Atomic Mass amu u, Size of cells and cell organelles Micrometer um (1o-®m), Speed / Velocity (u or v) meter per second m/s, Displacement (s) metre m, Acceleration (a) metre per second? m/s2, Force (F) Newton Nor kgms~2, Momentum (p) kg metre per second kgms~!, Relative Density Nil Nil, Work Joule JorNm, Energy / PE / KE Joule JorNm, Power Watt Wor Js™, Commercial unit of Power Unit Kwh = 3.6 x10° J, Frequency (v) Hertz Hz, Wavelength (A) metre m, Time period (T) second s

Page 2 : 100., , Differentiate between work and power., , , , Work, , Power, , , , a) Work done by a force is equal to the, product of force and the, displacement in the direction of force, , a) Power of a source is the rate of doing, work by it., , , , b) Work done does not depend on time., , b) Power spent depends on the time in, which work is done., , , , , , c) S.L. unit of work is Joule (J), , , , c) 3. S.1. unit of power is watt (W), , , , 101. Differentiate between energy and power., , , , Energy, , Power, , , , a) Energy of a body is its capacity to do, work,, , a) Power of a source is the rate at which, energy is supplied by it., , , , b) Energy spent does not depend on, time., , b) Power depends on the time in which, energy is spent., , , , c) S.L. unit of energy is joule (J)., , , , c) SL. unit of power is watt (W)., , , , 102. Differentiate between the potential energy and kinetic energy., , , , Potential Energy, , Kinetic Energy, , , , a) Itis the energy possessed by a body, due to its changed position or, configuration., , a) Itis the energy possessed by a body, due to its state of motion., , , , b) It is equal to the work done in, bringing the body to its changed state., , b) It is equal to the work that a moving, body can do before coming to rest., , , , c) Itcan change only in form of kinetic, energy., , c) It can change into any other form., , , , d) It does not depend on the speed of the, body., , , , d) It depends on the speed of the body.

Page 3 : Device Use Energy change, @ Electric bulb to get light — Electrical energy —> light energy, @ Induction cooker to get heat Electrical energy —> Heat energy, , © Storage battery, (while charging), @ Electric stove, @ Electric fan, @ Microwave oven, @ Inverter, (while charging), @ Inverter, (while discharging), @ Mixer grinder, , , , to store current, , to get heat, , to get breeze, , to get heat, , convert AC into DC, , convert DC intoAC, , for grinding, , , , Electrical Energy —» Chemical energy, , Electrical energy — Heat energy, Electrical energy —» Mechanical energy, Electrical energy + Heat energy, Electrical Energy —> Chemical energy, , Chemical energy + Electrical Energy, , Electrical energy —» Mechanical energy