Four resistors of resistance 9ohm, 3ohm, 18ohm, and 27ohm are connected in series and in parallel. What is the equivalent resistance of the combination? - Quora
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What is the equivalent resistor of different resistors in series or in parallel if they have a different wattage and different resistance? - Electrical Engineering Stack Exchange
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Two 1 ohm resistors are connected in parallel. What is the total resistance? - Quora