Energy Quiz Flashcards
Energy is always…
conserved
Define the law of conservation of energy
Energy always either transfers or transforms
Input energy= output energy
Types of energy, GO
Thermal Light Electrical Kinetic Sound Chemical potential Nuclear potential Elastic potential gravitational potential
Units for energy, GO
Joules
What would the most energy efficient device have as a property?
It converts the most input energy into useful output energy
Whats required for a system’s temperature to stay constant?
input energy has to equal the output energy
Define power
The rate of energy change, power=energy/time
Unit for power, GO
Watts
What affects heat transfer?
Colour+ texture
dark+ matt= best absorption
Advantages of low energy appliances, GO
Less energy used,
More money saved after annual payment
How do you find the power of an appliance using a circuit?
Measure the voltage across the appliance and the current flowing through it
Where would you get a.c and d.c from?
d. c = Batteries and solar cells
a. c = Mains electricity
Advantages of low energy appliances
don’t waste as much energy
More practical to use
Less carbon dioxide produced
