Energy Flashcards
What is energy
Energy is the abiity to do work
What is the unit for energy
Joules (j)
Name 6 types of energy
Poential,kinetic,chemical,light,heat,electrical,sound,nuclear
What is the principle of conservation of energy
Energy cannot be created or destroyed but only changed from one form to another
What is energy effinceny
Energy efficency means using the least amount of energy to do a task
How to calculate work done
Force x distance
What affects work
The mass and the distance
What type of energy would be in food
Chemical energy
What is energy dissipation and give an example
Energy dissipation is when energy changes from a useful form to a not so useful form
EG: When a car brakes, its movement energy turns into heat due to friction.
Describe kinetic energy
Energy that a body has because it is moving EG: a ball rolling on the ground
Describe potential energy
Energy that a body has because of its relative to other bodies
Describe sound energy
Energy that is produced by a vibration
Describe chemical energy
Energy that is stored in food
Describe electrical energy
Energy that comes from the flow of electric charge
Describe solar energy
Energy that comes from the sun
How to calculate efficency of a device
Eg: lamp
electrical in=40J
Light out= 0.8J
0.8 X 100 = 2%
___ ___
40 1
What is the unit for power
watts (W)
Define power
Power is the rate at which work is done.
