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Combination of Series and Parallel

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Combination of Resistors - Problem L1

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Combination of Series and Parallel Resistors

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Resistances in Series and Parallel

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Important Questions

A piece of wire of resistance is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is , then the ratio is - 

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For two resistor and , connected in parallel, find the relative error in their equivalent resistance, if and

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How many resistors (in parallel) are required to carry 5A on a 220V line?

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A wire of resistance 'R' is cut into 'n' equal parts. These parts are then connected in parallel with each other. The equivalent resistance of the combination is?

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An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of and , then the ratio of the currents passing through the wire will be

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Two wires of same metal have the same length but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of the thicker wire is . The total resistance of the combination is:

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A wire of resistance 5 ohm is bend in the form of closed circle. What is the resistance between 2 points at the ends of any diameter of the circle? 

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A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12V the voltage across the coil is going to be

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An electric lamp of resistance , a toaster of resistance and a water filter of resistance are connected in parallel to a source. What is the resistance of an electric iron connected to the same source and takes as much current as all three appliances and what is the current through it ?

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Find the equivalent resistance between A and B.

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