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When Were Radios Invented?
Radios are invented by many inventors and scientists for over years. However practical use of radios such as for communication...
What is a Milliamp?
Because milli is a prefix meaning a thousand, a milliamp is one thousandth of an ampere. Usually used for rating batteries...
How do Digital Thermometers Work?
Digital thermometer contain temperature sensor such as Thermistor or RTD. It has specific resistance at room temperature....
What is LED Light?
An LED light is a light emitting diodes bulb. It saves a lot more energy, and if used in cell phones; it wouldn't emit...
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