14400926
Description
Flashcards by Rubah Albadri, updated more than 1 year ago
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Created by Rubah Albadri
over 6 years ago
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| Question | Answer |
| Define Energy. | Energy is the strength and vitality required for sustained physical or mental activity. |
| What unit is used to measure energy? | joules, symbol J. |
| How many different forms of energy are there and what are they? | 5, kinetic, heat, light, sound and electrical. |
| What is potential energy? | Potential energy is the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors. |
| Define energy transformation. | An energy transformation is the change of energy from one form to another. |
| Calculate how many joules of energy are in 4 MJ. | 4, 000, 000 J. |
| What is photosynthesis and how does it occur in plants? | Photosynthesis is the process by which green plants use sunlight to make nutrients from CO2 and H2O. |
| How can heat energy be transferred? | 'conduction, convection and radiation. |
| What exactly does the law of conservation of energy state? | the total energy of an isolated system remains constant, it is said to be conserved over time. This law means that energy can neither be created nor destroyed; rather, it can only be transformed/transferred from one form to another. |
| What does electrical energy power at your home? | It powers your;TV, phones, microwaves and toasters. |
| What is radiation? | Radiation is the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization. |
| What is conduction? | Conduction is the process by which heat is directly transmitted through the material of a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material. |
| What is chemical energy? | A means for living things to provide energy for themselves through chemical reactions. |
| Calculate how many mega joules of energy are in 250 000 J. | 250 MJ. |
| What is nuclear potential energy? | Is the potential energy of the particles inside an atomic nucleus. The nuclear particles are bound together by the strong nuclear force. |
| What is kinetic energy? | Kinetic energy is the energy used for movement. |
| What are the four types of potential energy? | gravitational, elastic and nuclear. |
| Give an example of conduction. | Heating a tin can of water using a Bunsen burner. Initially the flame produces radiation which heats the tin can. The tin can then transfers heat to the water through conduction |
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