Re: can you make a circuit using apple juice

It depends on what kind of a circuit you are planning on making.  Liquid
solutions conduct electricity through ions which are molecules that have
broken apart as they dissolved in water (or whatever liquid you might be
interested in).  Very good conducting solutions, like salt water, lemon, or
orange juice solutions are not nearly as good conducting electricity as
most metals, but they are much better at conducting electricity than oils.

Ordinary table salt is a good example of a molecule that forms ions when it
is dissolved in water.  If you put two electrodes in a salt solution, the
charged ions help conduct the electricity from one electrode to the other.

Acids, like citric acid that you find in lemon or orange juice, is also a
substance that forms ions when dissolved in water.

Neither salt or citric acid in their dry form, conducts electricity.  Water
is necessary to separate the molecule into ions.

Sugar is a molecule that doesn't break apart into ions when dissolved.  So
adding sugar to water won't increase the conductivity of the water.

Apple juice is mostly water and sugar, with not much acid in it (the tarter
that the juice tastes, the more acid is in there).  So, apple juice isn't
going to conduct electricity very well, compared with something like orange
or lemon juice.  You could probably measure how tart different batches or
brands of apple juice are based on the conductivity of the solution.

All that I have said applies mostly to low voltage circuits.  As the
voltage is increased, pretty soon the water itself will start breaking
apart into ions that conduct electricity.  So even though water or apple
juice are not very good conductors (with apple juice being a much better
conductor than pure or deionized water), when the voltage gets high enough
(like the 115 volts from your wall socket) there is enough conduction in
water or apple juice to electrocute people.  That is the reason that all
the household electric circuits near water (like a sink or a bathtub) are
supposed to be protected with a Ground Circuit Fault Interrupter or simply
GCFI.  The GCFI measures even small electric circuits passing to ground
through water and shuts of the electric circuit hopefully before anyone is
seriously hurt.

I hope that answers your question.