CATATAN BELAJAR MAMA

  1.          The function of lenses : magnify or reduce the size of the images of objects. 2.        Where the lenses are used? Lenses are used  in magnify glasses, microscopes, spectacles, cameras, telescopes, binoculars, and corrective glasses. 3.        How the heat is transferred? Explain your answer! Heat is transferred through conduction, convection, and radiation -        Conduction is the transfer of heat from one part to another within an object or between objects by direct contact. -        Convection is the transfer of heat from one region to another by the movement of fluids. -        Radiation is the release of heat from the surface of most bodies that is transferred directly from one region to another. 4.        What is refraction? The bending of lght at the boundary of the two media. 5.        Why the refraction occurs? Refraction   occurs because the speed of light changes as it enters a different medium. 6.        What are the component of electric cir

  SCIENCE SA 2 PREPARATION FOR PRIMARY 4 1.        what are the parts of an electronic circuits? Battery, switch, wires, and bulbs. 2.        What are the function of these? a.        Battery : the source of electricity in a circuit. b.       Switch : controls when an electric current can flow in an electric circuit. c.        Bulb : produces light when an electric current flows through it. d.       Wires : connect one electrical part to another and allow electric currents to flow in a circuit. 3.        What are conductor and insulator? Give 3 examples of each conductor and insulator! -           Electrical conductor are materials that allow an electric current to flow through them. Ex : steel, chopper, iron, aluminium -           Electrical insulator are materials that do not allow an electri curren t to flow through them. Ex : wood, porcelain, plastic, wire, cloth 4.        What is the differences of open and closed circuits? -           Open circuit : electric