Newton’s second law (F = m·a)
Leave one of force, mass or acceleration empty to solve for the missing SI value.
Open calculatorOhm’s law & electrical power
Solves the electrical circuit using Ohm’s law (V = I × R) and DC power formulas (P = V × I = I² × R = V² / R) — enter exactly two of four quantities and leave the other two blank.
V
DC power: P = V × I = I² × R = V² ÷ R. Enter power from device nameplate to calculate current or resistance.
W
A
Ω
Power (P)
36 WSolved value
Current (I)
3 ASolved value
Voltage (V)
12 V
Resistance (R)
4 Ω
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Enter any two of the four quantities. 12 V across a 4 Ω load draws 3 A and dissipates 36 W.
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Educational estimate only. Not medical, tax, legal or financial advice.