Resistor Watt Formula

So the power formula becomes pv v r after we found the power that the resistor requires we have to find a resistor that will handle that power. In electronic circuits resistors are used to reduce current flow adjust signal levels to divide voltages bias active elements and terminate transmission lines among other uses.

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The formula is w v x i or w i 2 x r or w v 2 r enter any two factors of v i and r voltage current resistance calculated power.

Resistor watt formula. A resistor is a passive two terminal electrical component that implements electrical resistance as a circuit element. The power p in watts w is equal to the squared current i in amps a times the resistance r in ohms w. Electrical power is the rate in time at which energy is used or consumed converted into heat.

Most resistors have their maximum resistive power rating given for an ambient temperature of 70 o c or below. The standard unit of electrical power is the watt symbol w and a resistors power rating is also given in watts. And also temperature will degrade the capacity of the resistor to handle powerfor example a thin film resistor will handle 80 of power dissipation at 85 degrees celsius and 50 at 100 degrees celsius.

First version of the voltage formula. V i r. The power p in watts w is equal to the squared voltage v in volts v divided by the resistance r in ohms w.

Ohms law can be rewritten in three ways for calculating current resistance and voltage. High power resistors that can dissipate many watts of electrical power as heat may be used as part of motor controls in power distribution systems or as test loads for generators. If there is a voltage v across a resistor r a current i flows through it.

If a current i should flow through a resistor r the voltage v can be calculated.

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