Energy Flashcards
(12 cards)
What are the types of energy stores?
Chemical, kinetic, gravitational, elastic, thermal, magnetic, electrostatic, nuclear.
What are the methods of energy transfer?
Mechanically, electrically, by heating, by radiation (light and sound).
What is the principle of conservation of energy?
Energy cannot be created or destroyed, only transferred or transformed.
What is the formula for efficiency?
efficiency = (useful energy output / total energy output) × 100%.
How can energy transfers be represented?
They can be represented by Sankey diagrams.
What is the relationship between work done, force, and distance?
work done = force × distance moved
W = F × d
What does work done equal?
Work done is equal to energy transferred.
What is the formula for gravitational potential energy?
gravitational potential energy = mass × gravitational field strength × height
GPE = m × g × h
What is the formula for kinetic energy?
kinetic energy = ½ × mass × speed²
KE = ½ × m × v²
How does conservation of energy relate to gravitational potential energy and kinetic energy?
It links gravitational potential energy, kinetic energy, and work.
How is power defined?
Power is the rate of transfer of energy or the rate of doing work.
What is the relationship between power, work done, and time taken?
power = work done / time taken.
