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PHOTOELECTRIC EFFECT Photoelectric effect was discovered by Heinrich Hertz in 1887. Photoelectric effect is a phenomenon in which electrons are emitted from the surface of a substance when certain electromagnetic radiation falls on it.…

RADIOACTIVITY PHYSICS FORM FOUR RADIOACTIVITY PHYSICS FORM FOUR:Introduction Radioactivity was discovered by Henri Becquerel in 1869. In 1898, Marie and Pierre Curie succeeded in chemically isolating two radioactive elements, Polonium…

ELECTRONICS FORM FOUR ELECTRONICS FORM FOUR:Conductors, insulators and semi-conductors An insulator is a material or object which resists flow of heat (thermal insulator) or electrical charges (electrical insulators). Examples are…

FUELS IN THE HOME Fuel is any material used for producing heat/energy. Uses of heat: cooking heating lighting  lighting  Types of fuel Wood Charcoal Paraffin Electricity Biogas Solar energy…

VENTILATION VENTILATION :It is a process of introducing and circulating fresh air in a room in order to get rid of undesirable gases and replace fresh air. Reasons for sufficient ventilation in the room to prevent humidity that on…

CARE OF THE SICK AT HOME This is also called home nursing Nursing is the act of looking after individuals by helping them do what they would otherwise do for themselves if they could. A sick person in a patient who might feel…

FOOD ITEMS MADE FROM DIFFERENT FLOUR MIXTURES  Balters It is a mixture of flour and an egg to which some liquid has been added to make it flour, N/B- mixture should be eaten well to trap air, Mixture becomes light…

PRINCIPLES OF WISE BUYING Buying is exchanging goods/services for money by a consumer. Ways of obtaining information used to enable a consumer wisely are: advertisement acquaintances, friends and associates by…

MAKING A BUDGET Def: of a budget It is a detailed plan of expenditure for a certain period of time also means money management Importance of budgeting A budget promotes wise purchasing priorities are drawn and one knows…

ENVIRONMENTAL HYGIENE Def of hygiene: Its everything in our surrounding and all conditions that influence our lives e.g houses around Compound Social amenities e.g schools, parks, cinema halls. Environmental hygiene: It is…