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Mastering Arduino by Jon Hoffman

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What is power?

Power is the amount of electrical energy transformed into another type of energy (heat, light or work) per second. Power is an important concept because it is what allows our electric circuit to do something. For example, if we created a circuit with a battery and a resistor, the resistor will convert the electrical energy to heat (or thermal) energy. All resistors also have a maximum power rating that they can handle therefore to ensure that we do not damage the resistors in a circuit we will need to know how to calculate power. Power is calculated by multiplying the voltage by the current and is measured in Watts.

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