# Ohm’s law Calculator

 The Ohm’s law (after Georg Ohm) defines the relationship between voltage (V), current (I) and resistance (R). Power (P) relationships appear as a logic consequence of the others. One ohm is the resistance value through which one volt will produce a current of one ampere. The Ohm’s formula is V = IR.

Voltage (V) is the difference in electrical potential between two points in an electronic circuit, and it is measured in volts (V).

Current (I) is a flow of electrons on a conductor, and it is measured in amperes (A).

Resistance (R) determines how much current will flow through an electrical device. Resistors are used to control or limit voltage and current levels. A high resistance will allow a small current to flow. A low resistance will allow a larger current to flow. Resistors are measured in ohms.

Power (P) is the voltage multiplied by the current, and it’s measured in watts (W).

Ohm’s law Pie Chart

### Electrical Calculations

Let’s say that a 12V car battery is connected to a 3 ohm light bulb. What is the voltage measured at the light bulb?

We can use our calculator and enter

V = 12.0 V
R = 3.0 ohms

We get

I = 4.0 A

### Parallel Resistors

Our calculator can also be used to find out the equivalent resistor of up to three resistors in parallel. For example, three 20-ohm parallel resistors are connected across a 120 V power source. What is the current of this circuit?

We use the section on parallel resistors and enter

R1 = 20 ohms
R2 = 20 ohms
R3 = 20 ohms

we learn that the equivalent resistor is Req = 6.7 ohms.

Now, we use the formula I = V/R and enter the known values of voltage and resistance

V = 120 V
R = 6.7 ohms

and we discover that the total current flowing is I = 17.91 amperes.

 Parallel Resistors R1 = ohms R2 = ohms R3 = ohms Req = ohms V = I R I = A R = ohms V = V V = P/I P = W I = A V = V V = sqrt( PR ) P = W R = ohms V = V I = V/R V = V R = ohms I = A I = P/V P = W V = V I = A I = sqrt( P/R ) P = W R = ohms I = A R = V/I V = V I = A R = ohms R = V2/P V = V P = W R = ohms R = P/I2 P = W I = A R = ohms P = VI V = V I = A P = W P = V2/R V = V R = ohms P = W P = I2R I = A R = ohms P = W

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