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The Ohm's law formula can be used to calculate the resistance as the quotient of the voltage and current. It can be written as: R = V/I. Where: R - resistance. V - voltage.
To calculate total resistance in series circuits, look for a single loop with no branching paths. Add all of the resistances across the circuit together to calculate the total resistance. If you don’t know the individual values, use the Ohm’s Law equation, where resistance = voltage divided by current.
To calculate the resistance, consider a section of conducting wire with cross-sectional area A, length L, and resistivity \(\rho\). A battery is connected across the conductor, providing a potential difference \(\Delta V\) across it (Figure \(\PageIndex{1}\)).
Ohms law is a simple formula that makes it easy to calculate voltage, current, and resistance. You can use it to find what resistor value you need for an LED . Or to find out how much power your circuit uses.
An object that has simple resistance is called a resistor, even if its resistance is small. The unit for resistance is an ohm and is given the symbol \(\Omega\) (upper case Greek omega). Rearrranging \(I = V/R\) gives \(R = V/I\), and so the units of resistance are 1 ohm = 1 volt per ampere:
Electrical resistance is the hindrance to the flow of charge through an electric circuit. The amount of resistance in a wire depends upon the material the wire is made of, the length of the wire, and the cross-sectional area of the wire.
Use our resistance calculator to calculate the resistance in ohms given voltage, current, or power. See the formulas to calculate resistance.