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Understanding Resistance and Ohm’s Law in Electrical Circuits

This overview covers the fundamental concepts of resistance and Ohm's Law, essential topics in electrical engineering. Resistance is defined as the property of materials that opposes the flow of electric charges, represented by resistors measured in Ohms (Ω). Georg Simon Ohm established a direct relationship between current and voltage, encapsulated in Ohm's Law (v = iR). Additionally, we explore conductance (G), the reciprocal of resistance, measured in siemens (S), and its relevance in simplifying electrical calculations. Understanding these principles is crucial for analyzing circuit behavior effectively.

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Understanding Resistance and Ohm’s Law in Electrical Circuits

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  1. Resistance and Ohm’s Law ECE 201

  2. Resistance and Ohm’s Law • The ability of materials to oppose the flow of electric charges is known as resistance. The circuit component that models this property is a resistor, as shown below. The value of the resistor is R. • The Unit of R is Ohms (Ω). ECE 201

  3. Ohm’s Law • Georg Simon Ohm experimentally observed that there is a direct relationship between the current flowing through a material and the voltage difference across it’s terminals. • This is expressed as Ohm’s Law, the most common form of which is v = iR. ECE 201

  4. Reference choices for v, i ECE 201

  5. Alternate forms of Ohm’s Law ECE 201

  6. Conductance, G • Conductance is the reciprocal of resistance • Symbol is G • Unit is S (siemens) • Alternate unit is mho (ohm spelled backwards) • Used to simplify calculations ECE 201

  7. Power in a resistor ECE 201

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