6. Energy Safty, saving and benefits Flashcards
Name 3 types of energy and define
Chemical; energy released during burning
Gravitational; depends on mass, height above the earth and the force of gravity
Elastic; energy stored in an object when being compressed or stretched
Give 7 eg of socio-economical benefits of electricity
Job creation and disposable income in a community New employment Small business develop Change of lifestyle Improve security Improve education levels Rural development Improve life quality Access to modern technology Reduce air pollution Health benefits Medical advancements
What lighting system do homes usually use, and what is its disadvantage
Parallel, it can over load the main circuit
What devices prevent short circuits, discuss (8)
Fuses; connected to a series to prevent short circuits. It a metal that will melt (stoping the current) when the voltage is high
Circuit breakers; if the current is to high it will switch of/trip
Earth leakage system; prevents human/animal injury due to electrical shock
3-pin plugs; 3rd pin in a plug is connected to a cable in the ground. If the wire circuit it will direct the electricity into the ground and wont electrocute anyone
How do you save electricity in terms of using a geyser
Install a blanket Set the thermostat to 60 C Insulate the water outlet pipes Use less water Install a solar water heater
How do you save electricity in terms of lighting
Use fluorescent lights
Switch off the lights
Use low energy lamps
How do you save electricity in terms of electrical stoves
Use a pressure cooker for long preparation foods
Use a conventional oven
Keep stove closed until its cooked
Cover the stove with the whole pot
How do you save electricity in terms of microwaves
Defrost things in the fridge
Use it to cook small quantities of food
How do you save electricity in terms of ironing
Get a thermostatically controlled iron?😂
Use distilled water in steam irons
Turn of the iron if you aren’t using it
