Calculating Efficiency. Efficiency (%) = Useful Energy Out x 100 Total Energy In Questions 1) A light bulb takes in 30J of energy per second. It transfers 3J as useful light energy and 27J as heat energy. Calculate the efficiency. 2) A kettle takes in 2000J of energy per second. It transfers 1500J as useful heat energy and 500J is wasted as sound energy. Calculate the efficiency of the kettle. Remember: In the exam they may not
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developing a proposal for funding an environmental program or cause. The future of our world is unknown but with steady development‚ we can try to guarantee a better quality of life for every living thing by becoming an informed citizen is a key piece in saving our environment
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out the realm of normal and made it’s way into medical books. A shy person may now be one who is suffering from “avoidant personality disorder” or a number of other anxiety-relation mental disorders that has to be treated with antidepressants. In Saving Normal‚ Dr. Allen Frances argues that a high percentage of people diagnosed with mental illness are actually normal. This widespreasd medicalization of normality is leading to over-treatment and over-medicating of mental health issues. The biggest
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Sustainable Energy 1. How can electricity be defined? Electricity can be defined as the flow of electrical power or charge. It is a type of energy fuelled by the flow of electrons from positive and negative points within a conductor. 2. What is an electrical circuit? 3. What components are required to create an electrical circuit? In order to create an electrical circuit‚ you need: a) A source of electric power (battery or generator) b) A load to absorb the power (lamp
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WAYS OF SAVING MONEY In the present economic situation‚ the prices of different goods and services are always increasing everyday. Money has become quite hard to earn. Therefore‚ many people are looking for ways to save their money. In my opinion‚ as a housework‚ I think saving money at home is one of the best ways to save our money. According to our monthly income is high or low that we can have the good ways to save money at home. First of all‚ to people with high income‚ living standard
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Physics Energy Exploration Project Energy can be stored in many forms as potential energy. It can be extracted through chemical and mechanical processes to get usable energy. We use that kinetic energy and electricity every day to power our lights‚ run our cars and do most of our tasks. Fossil Fuel is a non-renewable energy source. It results from the decomposition of dead and buried organisms. They are millions of years old and are fossilized under rock and sand. They are efficient energy producers
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Energy Sources & Energy Transfer Renewable energy is energy which comes from natural resources such as sunlight‚ wind‚ rain‚ tides‚ and geothermal heat‚ which are renewable (naturally replenished). Sources: Solar Energy Wind Energy Hydropower Biomass Energy Hydrogen Geothermal Energy Ocean Energy A non-renewable resource is a natural resource which cannot be produced‚ grown‚ generated‚ or used on a scale which can sustain its consumption rate‚ once depleted there is no more available for
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In the story “Saving Sourdi” May-Lee Chai expresses the theme coming of age through the eyes of a young girl Nea who desperately tries to save her older sister as she becomes more mature and grown up. Nea is faced to deal with situations where she feels a need to save her older sister Sourdi from the people around her. As Sourdi begins to distance her self away from the family the differences between the two girls begins to show. Sourdi becomes more mature‚ gets married and starts her own family
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renewable energy sources have long been debated‚ and examined but environmentalists such as Thomas Friedman believe that the use and production of sustainable energy resources is the way of the future and particularly vital to the advancement of the human race and the world‚ as we know it. As renewable energy sources such as solar power continue to become a more sought after approach for our everyday energy needs‚ engineers and environmentalists are developing innovative ideas for renewable energy and
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Physical Light and Spiritual Light In this discussion‚ there are two kinds of light that are going to be compared. The two kinds of lights that are going to be compared against each other in this discussion are going to be; physical light and spiritual light. As we all know‚ the sun‚ stars‚ oil lamps will all eventually burn out‚ whereas the light of God is forever‚ so showing that spiritual light‚ God’s light‚ is much better than physical light. In Genesis 1:3 God said let there be light and there
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