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We are interested in finding out more about: strange electric power sources

QUESTION: can we use a lemon to light up a LED? How many lemons does it take to turn a LED ON?

HYPOTESIS: IF, like in a battery,we can obtain a chemical reaction between the acid lemon juice and two electrodes, in order to generate a flow of free electrically charged particles coming out from one metal and being atracted by the other, THEN we might get enough electrical energy to light up the LED. LEDs are very low energy consuming devices that emit light.

We will try to make an electrical circuit with some lemons and a LED. We will measure the electrical energy produced, and see if it is enough to light up a LED.

Plan:

1. Test the LED with the 3volts battery, to check it works.

2. In a fresh lemon, insert a zinc plated nail and a copper penny. Let´s call this device a voltaic cell.

3.Using a Multimeter see if there is any electrical energy (in volts) between the first and last metalic parts (or electrodes) and have it registered in a table. If not, then stop the experiment and review the components.

4.Compare the obtained cummulative values to the LED 3 volts needed.

5.If the cummulative values aprox. match the 3 volts needed, make a circuit with the LED. If the values are below the 3volts, then add another voltaic cell (step2) to the experiment. Connect electrodes of the opposite sign and go to step 3.

Materials needed:

.-a few lemons

.-zinc plated nails

.-copper pennies

.-wires and conectors

.-3 Volts battery

.-3 Volts LED

.-1Multimeter

Conclusions:

1. the acid juice of a lemon can produce a chemical reaction, in some metals, capable of transforming chemical energy into electrical energy.

2. I can get enough energy out of some lemons to set a LED ON.

For how long can I keep the LED ON?. Same time with the regular battery? Why?

4 GRADE SCIENCE FAIR

LAB REPORT

ELECTRICITY

TH

By: Alexandra Lacalle . (4.3)

A regular battery is made out of two different electrically charged metals (electrodes) in contact with an acid solution called electrolite. When the battery is connected to an electric circuit, a chemical reaction occurs inside, transforming chemical energy to electrical energy.

LAB TEST

Data Collection:

V1

V2

V1

Number of

lemons Value in

connected Volts

1 0.54

2 0.99

3 1.41

4 2.33

5 3.13

V2

V3

V4

V5

Question:

OBSERVATION:

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