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What is the Current in a Parallel Circuit?

1. In a
parallel circuit the current depends on the

resistance of
the branch (see the
calculation below).

2. The total
current flowing in
to the branches is

equal to the total current flowing
out of the branches.

In the circuit diagram below
A_{1} = A_{5}

How to Calculate the Current in a Parallel Circuit.

The current at A_{2} flowing through the 2 ohm resistor

can be found using the equation V
= I
x R.

The equation can be rearranged to give

current
= voltage
÷ resistance
I =
V
÷ R

If the supply voltage is 12 volts,

I = V ÷ R

= 12 ÷ 2

= 6 amps.

See the next page for how to calculate the current
in

the other two resistors and the total
current in the circuit.

You would get the same answer for the
current in

the 2
ohm
resistor,
whether or not the other resistors

are
connected in the circuit.
For the parallel circuit

above, each
component behaves
as if it is

connected on its own to
the cell, and is unaware of the

other components.
See lamps
in a parallel circuit.

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