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Physics - Parallel circuits

Parallel circuits

A parallel circuit [1] is defined as one in which there are alternative

paths for the flow of electricity. In the circuit shown, any coulomb of

charge leaving the battery will either pass through one load OR the other.

It cannot pass through both loads. The voltage provided by the battery must

be fully used by that one load item. Hence

The current path is divided and a portion of the total current flows

through each load. Since current is defined as the number of coulombs of

charge past a given point per second, the sum of the current in each branch

of the circuit must equal the total current in the circuit. Note that the

current coming out of the supply must be equal to the current returning to

the supply

Since the current has alternative paths that it can take, any coulomb of

charge will only flow through one load. With any two particular load

resistances, the result of constructing a parallel circuit rather than a

series circuit is that the total circuit resistance will be considerably

less. The total resistance of a parallel is given by:

Some circuits involve a combination of items connected in parallel with

one another, then connected in series with other items. Wherever

appropriate, calculate the resistance of the parallel part of the circuit

first and treat this as being in series with the other items.

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[1] http://alison.com/#

may I know why's the current flow in the circuit diagram is from the negative terminal? Thanks.

Guys thanks very much for your notes they seem wonderful and very clearly.I hope to pass the course at the end.Asanteni Sana