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1.2

Minor Versionm

by Vishal Bhatt

Introduction

Electrical conductivity is the measure of the amount of electrical current a substance can carry.

Video Overview

    • Handle scissors with care.

  1. The DIY Battery Holder is designed to provide 3V, using two AA cells along with a foam piece, aluminium tape, connecting wire and a cardboard base. For more details on making a DIY Battery Holder, please go to DIY Battery Holder.
    • The DIY Battery Holder is designed to provide 3V, using two AA cells along with a foam piece, aluminium tape, connecting wire and a cardboard base. For more details on making a DIY Battery Holder, please go to DIY Battery Holder.

  2. Connect the shorter leg (negative leg) of the LED to the negative terminal of the battery. Connect the longer leg (positive leg) of the LED to the connecting wire, after removing 1-2 cm of insulation from both its ends. Connect the longer leg  of the LED bulb to the connecting wire  and  shorter leg of the LED to the negative terminal of the battery.
    • Connect the shorter leg (negative leg) of the LED to the negative terminal of the battery.

    • Connect the longer leg (positive leg) of the LED to the connecting wire, after removing 1-2 cm of insulation from both its ends.

    • Connect the longer leg of the LED bulb to the connecting wire and shorter leg of the LED to the negative terminal of the battery.

    • The free ends of the wire are now your test leads.

  3. Use these test leads to check the conductivity of water, a safety pin and a pencil lead. If the LED glows, then the result is positive and the sample/material being tested conducts electricity. If the LED does not glow, then the result is negative and the sample/material being tested does not conduct electricity.
    • Use these test leads to check the conductivity of water, a safety pin and a pencil lead.

    • If the LED glows, then the result is positive and the sample/material being tested conducts electricity.

    • If the LED does not glow, then the result is negative and the sample/material being tested does not conduct electricity.

  4. Let's check the conductivity of a rubber band, toothpick and plastic button. If the LED glows, then the result is positive and the sample/material being tested conducts electricity. If the LED does not glow, then the result is negative and the sample/material being tested does not conduct electricity.
    • Let's check the conductivity of a rubber band, toothpick and plastic button.

    • If the LED glows, then the result is positive and the sample/material being tested conducts electricity.

    • If the LED does not glow, then the result is negative and the sample/material being tested does not conduct electricity.

    • If the LED does not glow with cells in the battery holder, then -

    • Check for the connections between the test leads and the battery terminals.

    • To ensure proper connectivity -

    • Wind the wire several times over the material being tested.

  5. Check the conductivity of table salt (NaCl) solution and sugar solution. Check the conductivity of  an iron nail and copper strips. Check the conductivity of milk and ketchup.
    • Check the conductivity of table salt (NaCl) solution and sugar solution.

    • Check the conductivity of an iron nail and copper strips.

    • Check the conductivity of milk and ketchup.

    • To learn more about the variations, please go to Matter - Electrical Conductivity (Variations).

Finish Line

Vishal Bhatt

Member since: 04/26/2017

2,752 Reputation

81 Guides authored

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