# How to Find the Antenna Power Density (APD)?

Antennas are structures that receive or transmit electromagnetic signals, such as radio or television signals. When using an antenna to transmit these signals, it is important to ensure that the s... Read More »
http://www.ehow.com/how_7359786_antenna-power-density-_apd_.html

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## How Do I Calculate Power & Energy Density?

Two quantities that arise frequently in science include power and energy density. Power comprises the amount of energy a device uses or generates every second. The scientific unit for power is the ... Read More »
http://www.ehow.com/how_6832621_do-power-_amp_amp_-energy-density_.html

## The Properties of Power Spectral Density?

Signal is recognized as waves in the discipline of physics, such as an electromagnetic wave. The power the wave is carrying is known as power spectral density. The common unit expressions for power... Read More »
http://www.ehow.com/list_7371983_properties-power-spectral-density.html

## What is a power antenna?

A power antenna refers to a car radio antenna that automatically rises when you turn on the car radio. Power antennae pick up radio waves from AM and FM radio stations.References:Antenna Masts R Us... Read More »

## What is the power density of a cell phone?

The power density of a cell phone varies by model. In the United States, cell phones cannot emit more than 1.6 watts per kilogram of body mass, according to the National Institutes of Health.Refere... Read More »

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