How To Find Resistance With Power And Voltage

The power used or dissipated by a resistor can be found using the formula v ir.

How to find resistance with power and voltage. Voltage volts current amps x resistance ω. If you only know the power and voltage you can use a similar approach to find resistance. This calculator is based on simple ohm s law as we have already shared ohm s law p i v r calculator in which you can also calculate three phase current. V i r and the power law equation formula.

But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. Substitute v r for i in the power formula. Rearrange ohm s law in terms of i. Influare international ampere or intensity and r resistance.

Find the voltage applied across 15 kω resistors when 10 ma current flows through it. P i v. Ohms law states that voltage current x resistance so by rearranging the formula resistance voltage current. Calculate voltage and resistance given power and current just enter the two known quantities describing the electrical current and the other two will be calculated based on them.

By knowing any two values of the voltage current or resistance quantities we can use ohms law to find the third missing value ohms law is used extensively in electronics formulas and calculations so it is very important to understand and accurately remember these formulas. Find resistance from power and voltage. Amperes milliamperes milliwatts watts kilowatts megawatts gigawatts millivolts volts kilovolts megavolts ohms kiloohms and. One ohm is defined as the resistance which allows the current of one ampere under a potential difference of 1 volt.

V voltage electric potential difference δ v or e electromotive force emf voltage. The needed factor will be calculated for you when you click on the calculate button for that table. This formula can be used to substitute for the voltage or for the current in the power formula and the power output of a battery that has internal resistance can be found using the formula v ε ir and the formula for power. The electrical relationships between resistance r current i power p and voltage e is defined by ohm s law.

V 10 ma x 15 kω. V 150 v. Using the example in step 1 with a voltage of 50 volts and a current of 2 amps the resistance is 50 2 or 25 ohms. How to calculate power.

To find the voltage v v i x r v volts i amps x r ω. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps and resistance r measured in ohms. P power i or j latin. The result will be displayed in the metrics chosen with supported metrics being.

I v r. P v v r. Remember to use the total voltage across the circuit or the voltage of the battery powering the circuit. The nominal impedance z 4 8 and 16 ohms loudspeakers is often assumed as resistance r.

Calculate the resistance in ohms by dividing the voltage by the current.