## OHM’S LAW

**What Is OHMS LAW **

Ohms law states that the current flowing through a conductor is proportional to the potential difference across it. Furthermore, the electrical resistance of the conductor is constant. This leads to mathematical equations fundamentals.

Here I mean current in amperes, voltage in V volts and R resistance in ohms. To illustrate: A resistor of one ohm subject to a current of 1A has a voltage difference of 1V across its terminals. V I R High Resistance Lower Resistance This equation is named after George Om.

In 1827 he published his research, which is the basis for the formula used today. He conducted a large series of experiments showing the relationship between applied voltage and current through a conductor. So the law is empirical. Although Om’s law was one of the basic principles of electrical engineering, it was widely criticized at the time of publication. Om is accepted as the official SI unit for electrical resistance. Gustav Kirchhoff (known from Kirchhoff’s circuit laws) made the most commonly used generalization in physics.

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### OHM’S LAW AND RESISTORS

Electrical resistance is shown in Ohms, and is not the same as resistivity. While resistivity is a material asset, resistance is the substance of an object. The electrical resistance of the resistor is determined by the combination of the condition and the resistance of the object. For example, a wirewound resistor with a long, thick wire has a high resistance then for a short and thin wire.

A wire-wound resistor made of a material with high resistivity has a high resistance value and then a low resistivity. A simulation of a hydraulic system can be made, in which water is pumped through a pipe. If the pipe is long and narrow, the height will be greater. A sand-filled pipe will withstand the flow of water over sandless sand (protective material).

### OHM’S LAW EQUATIONS

The Ohms formula can be used when two of the three variables are known. The relationship between resistance, current and voltage can be written in different ways. To remember this, the Om Triangle Calculator helps. The following two examples show the use of a triangle calculator.

### OHM’S POWER LAW

A resistor dissipates energy as an electric current passes through it. Energy is released in the form of heat. Function of power current I and applied voltage V:Where P is the energy in watts. Combined with Om’s law, the law of energy can be rewritten

Ideal resistors dissipate all energy and do not store electrical or magnetic energy. Each resistor has a limit of power that can dissipate without creating damage. This is called a power rating. Environmental conditions can reduce this value.

For example, an enclosure or high ambient temperature resistor around the resistor reduces the dissipating energy. This effect is called derating and can be seen with the power derating chart. In practice, resistors have a recommended power rating. However, the majority of resistors are rated at 1/4 or 1/8 watts. The circle diagram helps to quickly find the relationship between electrical power, current, voltage, and resistance. Each of the four parameters is shown how to calculate their value.

## KIRCHHOFF’S CIRCUIT LAWS

Resistor network theory requires Kirchhoff laws. They were created in 1845 by the German scientist Gustav Kirchhoff. Laws describe the interaction of power and charge in electrical networks. They are also known as Kirchhoff circuit laws. Kirchhoff also contributed to other fields of science, so the general term of Kirchhoff law can have different meanings. Circuit laws, both Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) are described in detail.

### KIRCHHOFF CURRENT LAW

According to Kirchhoff Current Law (KCL), the sum of all currents leaving a node in any electrical network is always equal to zero. It is based on the principle of electric charge conservation. This law is also known as Kirchhoff’s first law.

Look for it in the formulaic form at an arbitrary “node A” from the resistor network. Three branches are connected to this node. Two of the currents are called: I1 2 amperes and I2 4 amperes. Current law requires that the sum of I1, I2, and I3 be zero

### KIRCHHOFF VOLTAGE LAW

The second law is also known as the Kirchhoff Voltage Law (KVL). The amount of voltage across all the elements in the closed loop increases and the voltage drops. In formulaic form: Consider a part of the resistor network with an internal closed loop, as shown in the figure below. We want to know the voltage drop between node B and C (VBC). The sum of the voltage drops in the loop ABCD should be zero, so we can write

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