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What happens to the Voltage
and Current

in a Circuit when Cells are connected in Series?

The current
in the circuit below can be calculated

using the equation

voltage = current x
resistance V = I x R

The equation
can be rearranged to give

current
= voltage
÷ resistance
I =
V
÷ R

In the circuit above, V = 6 volts and R = 3 ohms.

I =
V
÷ R

= 6 ÷ 3

= 2 amps.

What happens to the Voltage
and Current

in a Circuit if Two Cells are connected in Series?

If an identical cell
is
placed in series
with

the original
cell, the current in the circuit doubles

because the total voltage of the circuit doubles.

In the circuit above,

R = 3
ohms and V
= 6 + 6 volts = 12 volts.

I =
V
÷ R

= 12 ÷ 3

= 4 amps.

Cells connected together
are called a battery.

If more cells (or batteries)
are connected together

in series then the total
supply voltage is the

sum of the individual
voltages for each cell if they are

connected the right way round, plus
to minus.

Compare this with cells in parallel.

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