Thu May 10, 2012 By: Ishaan Khare

In a series connection,we have studied in theory that the current is same and constant which is passing through them.My question is that dont the resistors utilise some current of the circuit and so it may lessen the amount of current passing through the other resistors???????

Expert Reply
Thu May 10, 2012
The first principle to understand about series circuits is that the amount of current is the same through any component in the circuit. This is because there is only one path for electrons to flow in a series circuit, and because free electrons flow through conductors like marbles in a tube, the rate of flow (marble speed) at any point in the circuit (tube) at any specific point in time must be equal.

second principle of series circuits: the total resistance of any series circuit is equal to the sum of the individual resistances. This should make intuitive sense: the more resistors in series that the electrons must flow through, the more difficult it will be for those electrons to flow. In the example problem, we had a 3 k?, 10 k?, and 5 k? resistor in series, giving us a total resistance of 18 k?:

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