Ohm’s Law Applied to Lemons

Simon wrote a poster with electricity formulas (from memory) this morning and applied one of them (Ohm’s law) to his advanced lemon experiment.

 

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We had already tried this experiment before but one lemon did not light an LED. Simon’s become more of an expert this time around. He used not one but 4 lemons now and measured the voltage (in Volts) and the current (in Amperes).

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And he employed his sister as assistant.

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The four lemons gave us almost 4 Volts!

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Simon used his voltage and current measurements to determine the resistance:

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He then decided that 24 Ohms was too little and added a resistor to his lemon circuit:

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But with a resistor the LED light did not light up – apparently the voltage became too low. After all, the voltage is the resistance times the current. I suggested Simon try it again without the resistor, with the almost 4 Volts the lemons made. And it worked!

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