# Difference between revisions of "Energy in a signal"

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Energy is the ability or potential for something to create change. Scientifically energy is defined as total work done by a force. Work can be mathematically calculated as the line integral of force per infinatesimal unit distance, |
Energy is the ability or potential for something to create change. Scientifically energy is defined as total work done by a force. Work can be mathematically calculated as the line integral of force per infinatesimal unit distance, |
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: <math> W = \int \mathbf{F} \cdot \mathrm{d}\mathbf{s}</math> |
: <math> W = \int \mathbf{F} \cdot \mathrm{d}\mathbf{s}</math> |
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+ | Power represents a change in energy. |
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+ | : <math> P(t) = \frac{dW}{dt} </math> |
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+ | This means we can also write energy as |
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+ | : <math> W = \int_{-\infty}^{\infty} P(t)\,dt</math> |
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===Energy of a signal=== |
===Energy of a signal=== |

## Revision as of 19:40, 10 October 2006

### Definition of Energy

Energy is the ability or potential for something to create change. Scientifically energy is defined as total work done by a force. Work can be mathematically calculated as the line integral of force per infinatesimal unit distance,

Power represents a change in energy.

This means we can also write energy as

### Energy of a signal

From circiut analysis we know that the energy of a voltage source is,

Assuming that R is 1 then the total energy is just,

This page is far from complete please feel free to pick up where it has been left off.