how to calculate effective resistance.
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R = V ÷ I Question
What is the resistance of the lamp? To calculate the resistance of an electrical component, an ammeter is used to measure the current and a voltmeter to measure the potential difference. The resistance can then be calculated using Ohm's Law.
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The effective resistance between vertices a and b (after connecting a voltage source between them) is defined as the potential difference between a and b per unit net current from a to b. In other words, Rab = va vb Iab . Once we fix the current from a to b to be Iab = 1, the effective resistance becomes Rab = va vb.
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