eng 1.2. and 1.2.2

Energy

A fundamental entity of nature that is transferred between parts of a system in the production of physical change within the system and usually regarded as the capacity for doing work.

Efficiency

The ratio of useful energy output to the total energy input, or the percentage of work input that is converted to work output.

Nonrenewable Energy

A resource that cannot be replaced once used.

Renewable Energy

A resource that can be replaced when needed.

Inexhaustible Energy

An energy source that will never run out.

Electricity

The flow of electrical power or charge.

abstraction

The result of taking away or removing characteristics from something in order to reduce it to a set of essential characteristics. (verb) The process of taking away or removing characteristics from something in order to reduce it to a set of essential characteristics.

black box

In science, computing, and engineering, a black box is a device, system, or object which can be viewed in terms of its inputs and outputs, without any knowledge of its internal workings.

systems thinking

Understanding a system by examining the connections between the parts that compose the entirety of the system.

system

A group of interacting, interrelated, or interdependent elements or parts that function together as a whole to accomplish a goal. Change happens if you add or remove a part

trade-off

An exchange of one thing in return for another: especially relinquishment of one benefit or advantage for another regarded as more desirable.

sustainable

A method of harvesting or using a resource so that the resource is not depleted or permanently damaged and will still be available for future generations.

Input

1. Something (such as energy, money, information, and so on) that is put into a system so that it can operate.2. Information or signals entered into a computer system. Examples of an input device are a button, keys on a keyboard, touch screen, and accelerometer.

Open Systems

A system that has external interactions. Such interactions can take the form of information, energy, matter, or force transfers across the system boundary.

closed system

A system that is isolated from its surroundings by a boundary that allows no transfer of matter, energy, force, or information across it.