Q7 of 50 Page 379

Two resistors of 5 Ω and 10 Ω are connected in parallel. Eight such sets are connected in series.

Find the equivalent resistance of this combination.

Equivalent resistance of the parallel combination is






These eight resistances are connected in series, so





So, the equivalent resistance of the combination is


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What is the commercial unit of electrical energy? Convert it into joule. What is the other name of the commercial unit? What is meant by a parallel combination of resistors? Deduce an expression for the equivalent resistance when two resistor are connected in parallel.

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