Energy Random
What is energry transfer?
Energy moving from one thing to another and staying in the same form
Where do people and other animals get energy to move around?
Sunlight provides food for plants and animals and food gives us chemical energy to function
Which flower is not actually a flower?
A sunflower
Give an example of a renewable resource.
answers may vary
e.g. biomass, wind, tidal, hydroelectricity, geothermal
What does the law of conservation of energy state?
Energy cannot be created nor destroyed only transferred or transformed.
What is energy transformation?
Energy changing forms
What object provides a source of electrical energy through wind power?
Wind Turbines
A bat can eat up to how many insects each hour?
One thousand
Give an example of a nonrenewable resource.
nuclear (uranium)
coal
oil
natural gas
Car engines operate by burning petrol to release stored energy. In most engines, only one-third of that energy can be used to move the car. What happens to the rest of the energy?
It is released as thermal energy
What is the energy transformation for a toaster?
Electrical to thermal
Explain how water in a dam can produce electricity.
The kinetic energy of the falling water creates enough pressure and movement to generate turbines that produce electrical energy.
Which animal has black skin and see-through fur?
A polar bear
What are some benefits of renewable resources?
Most are environmentally friendly, energy of the future....etc. Don't tend to release carbon dioxide
A ball at the top of a hill has 645kJ of gravitational potential energy. The ball rolls down the hill but only has 512kJ of kinetic energy. Why hasn't all of the GPE turned into KE?
As the ball rolls down the hill friction occurs between the ball and the ground and the ball and the air causing it to lose energy as heat to its surroundings. It also loses some energy
What is the energy transformation for a television?
Electrical to sound to light
Name three sources that can produce electricity.
Answers may vary (wind, water, biomass, geothermal, coal etc)
Many of our favourite fruits are in what plant family?
The rose family.
What are some benefits to nonrenewable resources?
Can produce large amounts of energy, not costly...etc.
A coal powered electrical station has an input of 200000MJ of energy. Only 25% of this energy is converted to electricity. How many joules of electricity are formed? What happened to the other 75% of energy?
50000MJ
rest mainly lost as heat
If you rub your hands together, what energy transformation took place?
Kinetic to Thermal
Write an energy chain to show the energy transfers and transformations in a coal powered power station
Answers will vary.
e.g. chemical (coal) --> heat (burning of coal) --> heat (boiling of water) --> kinetic energy (steam turning turbine) --> kinetic energy (turbine turning generator) --> electrical energy (produced from generator)
An octopus has how many brains?
Draw a diagram to show how a wind turbine works
answers may vary
What is energy measured in?
Joules (J)