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1.6

Minor Versionm

by Suchitha Vishwa

Introduction

Setup a circuit using AA batteries and an LED to test the electrical conductance of different material from daily life.

    • Scissors have functional sharp edges. Contact may result in injury. Always keep blades away from fingers and body. Handle with care.

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  1. Note the terminals(positive and negative) of the two AA Cells.
    • Note the terminals(positive and negative) of the two AA Cells.

    • Now stretch the cycle-tube band over a cell from one terminal to another. Do the same for the other cell.

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    • Now push the head of a safety pin into the space between the positive battery terminal and the band.

    • Repeat this for the other cell.

    • Push the positive terminal "pin" of one cell into the negative of the other cell. This will result in a 'U' shape with one pin sticking out.

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    • At this point your probe should look like this, as shown in the picture.

    • Cut the ice-cream stick into 2 rectangular pieces of about 4 cm each.

    • Push one of the pieces into the space between the band and their cells, on one side.

    What are these "different materials"? Give a few suggestions/examples....

    Procheta Mallik - Reply

    • Do the same on the other side of the batteries as well.

    • Bend the negative pin of the LED at a right angle about 1 cm from its base.

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    • Now insert the negative pin in-between the open negative terminal of the battery and twist it up around the band.

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    • Take the wires and remove a bit of insulation from both the ends.

    • Then take one end of wire and pass it through the loop on the positive pin. Twist it to make a secure electrical connection.

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    • Tie the other wire to the positive terminal of the LED. Then bend it around the ice-cream stick piece.

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    • The wires are now your test leads.

    • If the LED does not glow, it is an example of a negative result, in this case the material is an insulator.

    • If the LED glows, it is an example of a positive result, in this case the material is a conductor.

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    • The connections between the battery and safety pin might be loose,in that case hold the two terminals with your thumb and index finger for a better connection.

    • Make sure all the connections are clean and stable, otherwise the current will not flow.

    • To ensure proper connection, wind the wire several times over the material.

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    • Make a table and note down if the bulb glows for a particular material or not.

    • Classify the materials depending on whether the bulb glows or not, into conductors and insulators.

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    • Did you notice any common characteristic(s) for the materials that conducted electricity? What about those that didn't?

    • Could you find any difference in the brightness of the LED depending on the conducting material you tested?

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Finish Line

Vishal Bhatt

Member since: 04/26/2017

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50 Guides authored

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