Energy Flashcards
How do you find the work done on an object using an F/d graph?
To find the work done on an object from an F/d graph, you must find the area under the graph.
Define kinetic energy
Kinetic energy (Ek) is the energy possessed by a moving object.
How can a moving object do work?
A moving object has the ability to do work because it can apply a force on another object and displace it.
What is the work-energy principle?
The total amount of work done on an object which equals the object’s change in kinetic energy.
Define gravitational potential energy
Gravitational potential energy (Eg) is the stored energy an object has relative to it’s position above a point of reference.
What is an energy transformation?
The conversion of energy from one type to another is called an energy transformation.
What is the law of conservation of energy?
Since energy is neither created nor destroyed, the law of energy states that energy is transformed from one form to another. This means that no energy is lost.
How must one solve problems using the law of conservation of energy?
When solving problems, one must find the total mechanical energy at one moment (Et1) and compare it to the total mechanical energy at another moment.
Define efficiency
Efficiency is the ratio of the amount of useful energy produced (Eout) to the total amount of supplied energy (Ein). It is expressed as a percentage.
Define renewable energy
A substance with an unlimited supply or a supply that can be replenished as the substance is used in energy-transforming processes.
Define non-renewable energy
A substance that cannot be replenished as it is used in energy-transforming substances.
Define power
Power is the rate of doing work or transforming energy.
Define power rating
The maximum power of an electrical device or appliance is referred to as a power rating.
What is electrical energy measured in?
Electrical energy is measured in kilowatt hours (kWh).
Is it possible for an object to be 100% efficient?
No energy transformation is 100% efficient; the most common waste is energy is thermal energy.
