Please provide any 2 values and click "Calculate" to lớn get the other values in the ohm"s law equations V = I × R and phường = V × I.

Voltage (V):kilovolts volts millivolts
Current (I):amperes milliamperes
Resistance (R):ohms <Ω>kilohms megohms
Power (P):watts kilowatts megawatts horsepowersBTU/h


Ohm"s Law

Ohm"s Law states that the current through a conductor between two points is directly proportional lớn the voltage. This is true for many materials, over a wide range of voltages và currents, & the resistance and conductance of electronic components made from these materials remain constant. Ohm"s Law is true for circuits that contain only resistive elements (no capacitors or inductors), regardless of whether the driving voltage or current is constant (DC) or time-varying (AC). It can be expressed using a number of equations, usually all three together, as shown below.

V = I × R
R =V
I =V


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Electrical Power

Power is the rate at which electrical energy is transferred by an electric circuit per unit time typically expressed in the ham mê (International System of Units) unit of Watts. Power is typically produced by electric generators & supplied khổng lồ businesses & homes through the electric nguồn industry, but can also be supplied by electric batteries or other sources.

In resistive circuits, Joule"s Law can be combined with Ohm"s Law lớn produce alternative expressions for the amount of power dissipated, as shown below.

P = V × I
P =V2
P = I2 × R


Ohm"s Law Formula Wheel

Below is a formula wheel for Ohm"s Law relationships between P, I, V, và R. This is essentially what the does, & is just a representation of the algebraic manipulation of the equations above. To use the wheel, choose the variable to lớn solve for in the middle of the wheel, then use the relationship for the two known variables within the cross section of the circle.


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