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Energy
| Question | Answer |
|---|---|
| What is Energy? | Energy is the ability to do work |
| what is the unit for energy | The unit for energy is the joule |
| what are the different forms of energy | Kinetic Potential |
| name examples of Energy in Action | Kinetic Magnetic Electrical Light Thermal Sound |
| name examples of stored energy | Nuclear Potential Chemical |
| what is potential energy | Potential energy is the energy a body has due to its shape or position e.g. Springs |
| what is Kinetic energy | Anything that moves has kinetic energy e.g. Car moving |
| what is chemical energy | Anything with stored energy that can be released by a chemical reaction has chemical energy Examples of chemical energy include: food; fuels such as coal, oil and gas; batteries |
| what is nuclear energy | When the nucleus is disturbed, the atom may release this energy Examples of nuclear energy include the sun, power stations and nuclear bombs |
| what is light energy | Anything luminous gives off light energy, like the sun, light bulbs , candles and glow worms. |
| what is electrical energy | A wire carrying electricity can be used to supply energy to machines and heaters This a very convenient type of energy as it can easily be converted into many forms Electricity supplies energy to items such as fans, televisions and heaters. |
| what is thermal energy | Anything with a temperature above absolute zero (-273°C) has heat energy… that means everything has some heat energy! Examples include fire, radiators and heaters |
| what is sound energy | Sound is created when objects vibrate This makes the air around the object vibrate and causes our eardrums to vibrate, allowing us to hear Examples of sound energy include vocal chords, instruments and speakers |
| what is magnetic energy | Magnetic energy is the ability of some substances to attract or repel certain substances Examples of magnetic energy are: compass, MRI machine and scrap yard magnet |
| what is the formula to calculate energy efficiency | useful energy output over total energy output |
| name some renewable sources of energy | wind soalr hydroelectricity biomass wave tidal geothermal |
| tell me adv. and disadv. of wind energy | Advantage: Free source of energy Disadvantage: Cannot rely on the wind all the time |
| tell me adv. and disadv. of solar energy | Advantage: Clean/Green source of energy - does not cause pollution. Disadvantage: Sunlight is only available during day time - optimum during summer so can sometimes be unreliable. |
| tell me adv. and disadv. of hydroelectricity | Advantage: Helps control flooding in the surrounding area. Disadvantage: Homes/Habitats in the surrounding area can get damaged if the dam becomes flooded. |
| tell me adv. and disadv. of biomass | Advantage: Plants are readily available / No release of fossil fuels (environment). Disadvantage: Lots of smoke can be produced when burning biofuels. |
| tell me adv. and disadv. of wave energy | Advantage: Enormous amount of energy is available - lots of waves. Disadvantage: The amount of energy is dependent on the weather. |
| tell me adv. and disadv. of tidal energy | Advantage: Tides are reliable/predictable so we can know when to produce energy. Disadvantage: Prevents fish from moving around in certain areas. |
| tell me adv. and disadv. of geothermal energy | Advantage: Hot water/Steam produced can be used to also heat homes. Disadvantage: Expensive to build |
| name some non renewable energy sources | Fossil Fuels Nuclear fission |
| tell me adv. and disadv. of fossil fuels | Advantage: Easy to store, transport and distribute. Disadvantage: They release carbon dioxide which causes global warming. |
| tell me adv. and disadv. of nuclear fission | Advantage: Large amounts of energy can be produced from a small amount of fuel. Disadvantage: Accidents at nuclear power stations e.g. Chernobyl disaster caused death, cancer and other conditions. |
| What is Sustainability? | Sustainability is the practice of meeting people’s needs: without harming the environment ensuring that resources are there for many future generations at a reasonable cost |
| what is work | Work is done when an object is moved |
| what is the standard unit for work | The standard unit for work is the Joule (J) |
| what is the formula for work | Work = force x distance |
| what is power | Power is the amount of work done over a period of time |
| what is the standard unit for power | Watt |
| what is the formula for power | Power=Work -------- Time |
Created by:
JMahango
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