ECE 2011 Resistance and Ohm’s Law. ECE 2012 Resistance and Ohm’s Law The ability of materials to oppose the flow of electric charges is known as resistance.

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Presentation transcript:

ECE 2011 Resistance and Ohm’s Law

ECE 2012 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 2013 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 2014 Reference choices for v, i

ECE 2015 Alternate forms of Ohm’s Law

ECE 2016 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 2017 Power in a resistor