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Expanded Ohm’s Law Chart

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Voltage, current, resistance, and power can be calculated using ohm’s law. Below are the formulas for these calculations. At a given voltage when resistance increases, current decreases. When resistance decreases, current increases. The chart below left shows the relationship between voltage, current, and resistance. The chart below right shows the relationship between power, voltage, and current.

Ohm’s Law Calculations

Ohm’s Law

Expanded Ohm’s Law Chart

P =

E * I

E =

I * R

I =

P / E

R =

E / I

Ohms Law Table

120 Volt 100 Watt Light Bulb Circuit

120 Volt 100 Watt Light Bulb Circuit

Voltage (E) and power (W) are known, how to calculate current (I).

Ohms Law EIR Symbol

Ohms Law PEI Symbol

E = I * R

I = E / R

R = E / I

P = E * I

E = P / I

I = P / E

Ohms Law EIR Symbol 3

Ohms Law EIR Symbol 2

Ohms Law EIR Symbol 1

Ohms Law PEI Symbol 1

Ohms Law PEI Symbol 2

Ohms Law PEI Symbol 3

120 Volt 60 Watt Light Bulb Circuit

120 Volt 60 Watt Light Bulb Circuit

12 Volt 60 Watt Light Bulb Circuit

12 Volt 60 Watt Light Bulb Circuit

Voltage (E) and current (I) are known, how to calculate resistance (R).

Voltage (E) and power (W) are known, how to calculate current (I).