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Explain the Energy and Power in Circuits
Electrical power dissipated in a circuit or a single circuit element can be calculated using
P = I V
where power (P) is in watts if current (I) is in amperes and voltage (V) is in volts. We can combine this with Ohm's Law to give another form.
P = I2 R = V2/R
These forms are much easier for computing the heat generated by resistors.
The resistances of commercially-available discrete resistors are restricted to particular sets. For example, the available values of resistors with 10% tolerance are selections fro
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