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ACTIVATION ENERGY IS THE ENERGY WHICH IS REQUIRED FOR INITIALIZING OF ANY TYPE OF REACTION.
endothermic reactions
Activation energy describes the energy that is required to get chemical reactions started.
Active transport is the term used to define the means of particle transport that requires input of energy from the cell. The opposite of this would be passive transport.
Input actually is a maths term. However, the term "domain" may also be appropriate.
The meaning of the term conference calling is that a telephone or video hook up conversation that requires more than two peoples input on a single line can be so.
The term "active low" means that the input on an IC requires a logic low for it to be activated, i.e a low voltage (of course the voltage range is dependent on the technology, TTL, CMOS etc) Active high is the opposite... the input requires a logic high for it to be activated. A simple example to illustrate, an 8bit counter can count UP/DOWN this functionality is controlled with only one pin, an active high on that pin to count up or low to count down.
An RF (Radio Frequency) input is the technical term for a coaxial/antenna input on the back of a television. This input is often referred to as simply 'cable' or 'cable vision'.
Systemic
Input and output in medical terms is fluid going into the body, and fluid leaving the body.
Domain describes all possible input values.
The term for energy from the Sun is "solar energy." This is the energy that drives the water cycle and photosynthesis.