# UNIT 1.2 ENERGY CHANGES BRO

Flashcards by Musab Anzar, updated more than 1 year ago
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## Resource summary

 Question Answer WHEN ENERGY CHANGES UNIT 1.2 9a5f2c1e-d0cc-45a8-a423-cc936f3346da.gif (image/gif) BY MUSAB ANZAR #10448 YR 8 53d61ef5-44ca-41d4-83dc-00d19ddf2476.gif (image/gif) WHAT IS ENERGY EFFICIENCY? 27089ea3-cf5e-45cc-92b1-7d9f91ef2a41.gif (image/gif) ENERGY EFFICIENCY IS THE PROPORTION OF USEFUL ENERGY FROM A DEVICE COMPARED TO THE AMOUNT OF ENERGY THAT IS INPUT.THIS IS USUALLY EXPRESSED AS A PERCENTAGE. 57bfb9bc-e2d7-4c4c-9694-c8ff64cbe982.gif (image/gif) WHAT IS AN ENERGY FLOW DIAGRAM? 62300b6c-2c74-4869-bc9d-6eec211ffc52.gif (image/gif) A DIAGRAM USING ARROWS THAT SHOWS THE WAY ENERGY IS PASSED ON OR CHANGED INTO OTHER FORMS IN A PARTICULAR SITUATION. b0003d64-cefd-4176-97fa-7aa02ae27d1d.gif (image/gif) WHAT IS ENERGY TRANSFER? THE FLOW OF ENERGY FROM ONE OBJECT INTO ANOTHER OBJECT; FOR EXAMPLE, THE FLOW OF HEAT FROM A METAL SPOON TO YOUR HAND, OR THE FLOW OF KINETIC ENERGY FROM BAT TO A BALL THAT IT HITS. WHAT IS ENERGY TRANSFORMATION? THE CONVERSION OF ONE TYPE OF ENERGY INTO ANOTHER TYPE OF ENERGY, FOR EXAMPLE THE CONVERSION OF ELECTRICAL ENERGY USED IN AN MP3 PLAYER INTO SOUND, LIGHT AND HEAT AND ENERGY. WHAT IS THE LAW OF CONVERSION OF ENERGY? ENERGY CANNOT BE CREATED OR DESTROYED. IT CAN BE ONLY BE TRANSFERRED FROM ONE OBJECT TO ANOTHEROR TRANSFORMED INTO ANOTHER FORM OF ENERGY. WHAT ARE TWO TYPES OF ENERGY TRANSFER? THE FLOW OF HEAT FROM A METAL SPOON TO YOUR HAND AND THE FLOW OF KINETIC ENERGY FROM BAT TO A BALL THAT IT HITS. WHAT IS THE TYPE OF ENERGY PRODUCED BY A SOLAR CELL? ELECTRICAL ENERGY. WHAT IS HEAT ENERGY? Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another, and the transfer or flow due to the difference in temperature between the two objects is called heat WHAT IS CHEMICAL ENERGY? Chemical Energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by-product (exothermic reaction). Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. EHAT IS ELECTRIC ENERGY? Electrical energy is energy that is caused by moving electric charges. Since the electric charges are moving, this is a form of kinetic energy. The faster the electric charges are moving the more electrical energy they carry. WHAT IS LIGHT ENERGY? Light energy is the only form of energy that we can actually see directly. It is formed through chemical, radiation, and mechanical means. Light energy can also be converted into other forms of energy. Interesting Light Energy Facts: Light travels at a speed of about 300,000 km/s. WHAT IS LIGHT ENERGY USED FOR? The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. WHAT IS ELASTIC POTENTIAL ENERGY? Elastic potential energy is Potential energy stored as a result of deformation of an elastic object, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched. WHAT IS THE DIFFERENCE BETWEEN KINETIC AND POTENTIAL ENERGY? Potential energy is the stored energy in an object due of its position or its configuration whereas Kinetic energy is the energy which a body possesses because of its motion. TRUE OR FALSE A HUMAN IS 25% EFFICIENT. TRUE AN ELECTRIC MOTOR IS 80% EFFICIENT. TRUE A POWERSTATION IS 69% EFFICIENT. FALSE. A POWERSTATION IS 30% EFFICIENT. HOW EFFICIENT IS AN INCANDESCENT LIGHT GLOBE? 5% WHAT IS THE TYPE OF ENERGY POSSESED BY FOSSIL FUELS? HEAT ENERGY. THE END HOPE YOU GOT ALL WRONG. BY MUSAB ANZAR YR 8

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