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Yr 8 Energy Revision

What type of energy does a tennis ball have when you are holding it in your hand? Gravitational Potential Energy
What type of potential energy is found in food? Chemical potential energy
Can energy be created? No, it is converted from one form to another
When a torch is turned on is the energy transferred or transformed? Transformed
A toasted uses electrical energy to produce what type of energy? Heat
What are examples of renewable energy? Solar, wind, hydroelectric
True or false: Energy can disappear False
What is the law that relates to the transfer of energy? Law of conservation of energy
Can energy be passed on or wasted? Yes
A ball rolls down a slope. What type of energy is this? Kinetic
A candle is lit. What type of energy is produced? Heat, light
A phone is charged. What type of energy is this? electrical
Music is played through speakers. What type of energy is this? Sound
What is the formula for energy efficiency? Useful energy / total energy * 100 = Energy Efficiency
What does a Sankey diagram show? Useful and wasted energy
Energy that serves the purpose of the appliance is... Useful
Energy that is not intended for use by the appliance is... Wasted
Energy is stored in our bodies for later use. What type of energy is this? Chemical potential energy
How does the sun produce energy? Nuclear reactions
If an object does not have GPE where would I find it? On the ground
True or false: the sun is the source of energy for life on earth. True
What is potential energy? Stored energy
Would you call a lamp with an energy effciency of 20% efficient? No - 80% is wasted energy
A torch 80% energy efficient. What type of energy is the wasted energy? Heat
The energy starts in the sun. Travels to the Earth in 2 forms before being adsorbed by plants and converted again via photosynthesis. Name the 4 types of energy mentioned Heat, light, chemical, nuclear
What is the difference between transformed and transferred energy? The energy type changes in transformations
What material transfers heat energy most effectively? metals
Name 3 forms of potential energy. Gravitational, chemical, elastic, nuclear
Why is potential energy important? It stores energy so it can be released
Street lamp: Useful 25J, wasted Energy 75J. What is its energy efficiency? 25%
What is energy efficiency? How well an device changes energy to useful energy
What type of material is poor at allowing heat to move through it? Insulator
What unit of measurement is used to measure energy? Joules (J)
What type of energy does a skydiver have half way through his jump? Gravitational potential energy and kinetic
What type of energy is stored in a battery? Chemical
Created by: Sutt2019