Chapter 2 - Energy Flashcards
State the unit of energy
Joules or kilojoules if there are 1000 joules
What is the law of conservation of energy
Energy can nor be created or destroyed . Only transferred
State three way energy is transferred
Electric currents , light and sound are three way of transferring energy
State the unit of tempurature
Degrees celcius
How do u measure temperature
With a thermometer
What happens if you heat up a liquid
It becomes a gas . The particles vibrate faster
What is a conductor
A conductor is an object where energy is transferred very quickly through it . Eg (metal)
What is an insulator
They are objects that keep air warm . Eg (a duvet)
Name two sources of infrared radiation
The sun
What happens when infrared hits a shiny surface
When infrared hit this surface it reflects infrared heat
Name three fossil fuels
Coal , oil and gas
What greenhouse gas is produced when fossil fuels burn
Carbon dioxide
What are three renewable energy resources
Solar energy : generated from light , biomass energy : generated from plants ,wind : turns a turbine which creates energy
State the unit of power
Watts
What unit do electricity companies use
Kilo watts per hour
What is an equation that shows you how much work you’ve done
Work done = force X distance
Name two simple machines
A gear and a lever
