physics-energy Flashcards
True or false
Non-renewable energy sources such as fossil feels will run out
True
Name 3 renewable energy sources
Wind, hydroelectric, tidal,waves,geothermal,solar,food,wood
What is the most important type of energy we need to generate
Electrical energy
Name the different types of energy
Heat Elastic Chemical Kinetic Light Electrical Gravitational Sound
Describe the correlation between the mass of an object and the speed
Heavier objects will move faster
Which type of energy do all moving things have
Kinetic energy
What object would have more internal energy a hot cup of tea or a cold cup of tea
A hot cup of tea
Which energy is stored in stretched or squashed materials
Elastic potential energy
Name 4 ways energy can be transferred
Heating
Mechanically
Electrically
Radiation
True or false
Does the heat energy transfer from the hotter object to the cooler object
True
Name the types of waves that transfer energy through materials and form place to place
Sound and seismic waves formed during earthquakes
How is electrical energy transferred
Electrical energy is transferred when a circuit is complete
Names the waves and light that are forms of radiation
Visible light, Infrared light, microwaves and radio waves
When an object falls what energy is converted to kinetic energy
Gravitational potential energy the object possessed
Energy can be stored and transferred but what two things can it not be
Created or destroyed
The total energy stays the same value before and after arch fe what is this called
The conservation of energy
What is the diagram called that shows energy transfers
A sankey diagram
How can energy stored in food be released
By combustion
What is the unit for energy on food labels
Kj (kilojoules)
What describes the rate of energy that is used
Power
What does W stand for
Watt
What is the equation for energy costs
Energy in kWh = power in kW multiplied by time in hours
What is cheaper gas per kW or electricity per kW
Gas
What is the ultimate source of energy on the earth
The sun
