schoolscienceproject.blogspot.in
Coin current.
Place several
copper coins and pieces of sheet zinc of the same size alternately above one
another, and between each metal pair insert a piece of blotting paper soaked in
salt water. Electrical energy, which you can detect, is set free. Wind thin,
covered copper wire about 50 times round a compass, and holds one of the bare
ends on the last coin and one on the last zinc disk. The current causes a
deflection of the compass needle. In a similar experiment the Italian physicist
Volta obtained a current. The salt solution acts on the metal like the sap in
the potato in the previous experiment.
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