resistance  
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resistance - the property of any object or substance of resisting or opposing the flow of an electrical current.
Formula: R = V/I

Free Direct Current (Electrical Engineering) Ohms Law Calculator - Enter two of the following items from the DIRECT CURRENT(DC) electrical engineering set of variables, and this will solve for the remaining two:
* I = current(amps.)
* V = Electricity potential of voltage(volts)
* R = resistance(ohms)
* P = power(watts)

Parallel Resistors

Free Parallel Resistors Calculator - Given a set of parallel resistors, this calculates the total resistance in ohms, denoted Rt

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Resistor Color Codes

Free Resistor Color Codes Calculator - Given 3 Band level color codes and a tolerance color chosen, this calculates the resistance in ohms and the tolerance percentage

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