Ohm's Law for circuit wiring is named after German physicist, George Simon Ohm, who figured out that there is a direct connection between potential differences, conductors and resultant electric currents. He based his own research on a then recently invented electrochemical cell invented by Alesandro Volta, and from there he was able to define the fundamental relationship among voltage, resistance, and current. Electrical circuit analysis begins when the relationship between voltage, resistance, and current are defined.
Ohm’s Law is the very foundation of electronics and electricity, it is useful to know when you need to analyze and troubleshoot electrical circuits.
Ohm’s Law Formulas
Keep in mind that E stands for Volts, I is equal current or amperes and R stands for resistance.
- For Voltage: E=IxR
- For Current or Amperes: I=E/R
- For Resistance: R=E/I
Another formula used commonly in Ohm’s law is P=E2/R, where instead of voltage, you are looking for power. The variations are: P=I2xR and P=ExI, where P is equal to power, R stands for amperes and E stands for volts or watts.
Ohm’s Law for Circuit Wiring
Ohm’s law for circuit wiring states that the current going through a conductor between two points is directly comparative to the potential difference or voltage across the two points, and inversely proportional to the resistance between them, provided that the temperature remains constant. The mathematical equation I=V/R describes this relationship, where V is the potential difference measured across the resistance in units of volts; R is the resistance of the conductor in units of ohms; and I is the current through the resistance in units of amperes. Ohm’s law states that R is constant in this relationship.
In simple terms, Ohm’s law can be used to solve simple circuits. A closed loop is a complete circuit; it contains at least one source of voltage and at least one potential drop, or a place where potential energy decreases. The sum of the voltage around a complete circuit is always zero.
Closed Loop Network
An electrical circuit is a closed-loop network, where the path of the current goes around the loop. It consists of individual electronic components like resistors, transistors, capacitors, inductors, and diodes, often connected by conductive wires or traces through which electrical current is allowed to flow. Combination of components and wires allow various complex as well as simple operations to be performed. Computations can be conducted, data can be moved from one place to another and signals can be amplified. Individual pieces of wires can be enough to make an electronic circuit.
When to Use Ohm’s Law
Ohm’s law can be used to analyze electric circuits. It is most often used in the study of electric currents and electronics.