Amp to volt conversion8/3/2023 ![]() ![]() In 1881 it was suggested during the International Exposition of Electricity in Paris that the unit of electrical resistance is named after him. He was finally recognized for his contributions to physics when he was awarded the Copley Medal on the 30th of November, 1841 by the Royal Society of London. Unfortunately, in the beginning, his contemporaries did not grasp the importance of his work, and he was, in fact, made to resign from his post of a mathematics teacher in Cologne for publishing the results of his work in the local papers. This discovery had a tremendous impact on the research of electricity and on the development of methods to use it in daily life and in the industry. In one of his works published in 1827, he stated the famous law named after him that describes the relationship between the potential difference, electric current, and resistance. Georg Simon Ohm was an outstanding physicist, among the first to research electrical resistance. You can see how ohms relate to other units by using the unit converter on our website. Ohm and values derived from it such as kiloohms (kΩ) and megaohms or megohms (MΩ) are the SI units used to measure resistance. Resistance can be denoted by the letter R or r, and is considered a constant for a given conductor within specific limits. When we discuss electromagnetic fields and electromagnetic waves, then we talk about wave impedance. When we want to make sure to include both in our discussion of the behavior of circuits with alternating current, we talk about electrical impedance, which combines the specific case of resistance discussed above and capacitive and inductive reactance. When we say “resistance” we could mean a specific case in the example with thermal energy above, or we could talk about resistance and resistivity in general. If there is a large amount of inductance in the circuit, then we consider inductive reactance, and if there is capacitance, then we talk about capacitive reactance. On the other hand, when the electrical energy is reversibly converted into energy of a magnetic or an electric field, and if the alternating current runs through the circuit, we consider electrical reactance. When the conversion from electrical energy to thermal energy is irreversible, we talk about resistance. It is calculated as a ratio of the potential difference (voltage) between two points of the circuit to the current that runs through the circuit.Įlectrical resistance is related to the transport and conversion of electrical energy to other types of energy. In electrical engineering, resistance is a property of an electrical circuit or its part, which prevents electric current from flowing freely through it. The resistance of electrical cables must be as small as possible Definition of Electrical ResistanceĮlectrical resistance is a physical quality of matter to resist the loss-free flow of an electric current through it. We could say that along with the other passive electronic components such as inductors and capacitors, resistors are part of the foundation of our civilization as we know - they are the metaphorical whales that our world rests on. Given the amount of production of such devices globally, we can estimate that there are tens of trillions of them. Statistically, more than 35% of electronic components on circuit boards are resistors. It is enough to mention that in the most common electronics used today - mobile phones, smartphones, tablets, and computers - the number of resistors can reach several hundred thousand. It is used so much in today’s world, that we cannot even count all of the resistors - devices that operate based on resistance. Electrical resistance usually does not cause bewilderment or misunderstanding when we study it at school. For example, we face resistance of the other child, whose toy we try to borrow. When we are small, we explore our environment and learn about various types of resistance, not only in the electrical sense. We can say that the term “resistance” is more “lucky” than many other terms in physics, because we are used to this word and its meaning from early childhood. Resistors on this power supply circuit board are marked in red and make up half of its components.
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