Creating Batteries

Creating Batteries

 Circuits with baffling batteries

In Science this week we were really lucky to have 2 of the teachers from Douglas Academy visit us.  They led an experiment on how to use different kinds of fruit as a battery and how to measure the voltage created by the fruit.  We made a circuit, using one piece of fruit, 2 pieces of metal – zinc and copper, and attached them to a voltmeter to measure the voltage of the cell.

  

As we were conducting a scientific experiment, we could only change one variable at a time.  To begin with we changed the fruit.  We used a lemon, an orange, an apple and a tiny banana.  They all produced similar readings.  We rounded them to the nearest ten and then plotted them on a bar graph.

We wanted to see if changing one variable would affect the amount of electricity produced.  Too make it a fair scientific experiment; we changed only one variable at a time.  We decided to change one of the metals and used tin, instead of zinc.  Our readings were all much lower!  Mrs Farrell explained to us that when making a battery, you can change the strength of it by changing the metals.

  

After that we actually made a battery using saline solution, paper pads and the strips of metal.  This is exactly how a battery is made.  We measured the voltage of this battery and it was much higher than the fruit.

We had a really wonderful afternoon and are already looking forward to next week!