Energy and Power Flashcards
What is energy?
The ability or capacity to do work
What are the two types of energy?
Potential and KInetic Energy
What is Potential and Kinetic energy?
Potential- The energy a body has due to its position
Kinetic- The energy a body has due to its motion
What is gravitational energy?
Energy stored in an object due to its height above earth
What is chemical energy?
energy released from the breakdown of chemical bonds and can be harnessed and used in metabolical processes.
What is elastic energy?
Energy stored after applying a force to deform an elastic energy
What is electrical energy?
Energy produced due to the movement of electric currents
What is sound energy?
Energy produced when an object vibrates.
What is magnetic energy?
energy stored when repelling objects are pushed closer together and attracting objects are pushed farther apart.
What is nuclear energy?
Energy released during nuclear fusion
What is thermal energy?
Energy posessed by an object of system due to the movement of particles in that object or system
What is electromagnetic energy?
Energy reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space.
What is work?
When a force causes the motion of a body, work has been done
How do you calculate work?
Force x distance
How do you calculate work at an angle?
force x distance x cos
What is the unit for work?
Nm/J
What is the formula for potential energy?
mgh
chnange in potential energy- mgx x change in height
What is the formula for kinetic energy?
1/2 mv sqaure
What is the law of conservatin of energy?
Energy can neither be created or destroyed, But can be converted from one energy to another.
What is power?
The rate at which energy is transferred
What is power measured in?
Watts
What is efficiency?
How good a device is at transferring energy imput to useful energy output
What is the formula for energy efficiency?
useful energy transferred/ total energy supplies
