Energy Flashcards
What is energy?
Something that is needed for something to happen or change. The capacity to work.
What is the unit for measuring energy?
Joules (J) or Calories (Cal)
What energy is normally stored in food and batteries?
Chemical energy
What energy is often stored in moving objects?
Kinetic Energy
What energy is normally stored in hot object?
Thermal Energy
What energy is normally stored in stretched squashed or twisted materials?
strain or elastic potential energy
Can energy be created or destroyed?
No
Can energy be transferred from one store to another?
Yes
What is the law of conservation of energy?
That energy cannot be created nor destroyed. It can only be transferred between stores.
How can the efficiency of a device be calculated?
efficiency= (efficient energy used by device)/(total energy used by device)
