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1.4

Minor Versionm

by Procheta Mallik

Introduction

A copper coil connected to a battery acts as an electromagnet, which then interacts with a permanent magnet to simulated the functioning of a simple DC Motor

Video Overview

    • Be wary of the sharp/pointy end of the safety pins and the copper wire.

    • Exercise caution when using the paper cutter.

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  1. Take 60 cm of insulated (enamelled) copper wire and wind it around the battery.
    • Take 60 cm of insulated (enamelled) copper wire and wind it around the battery.

    • Carefully remove the coil from the battery.

    • Tie knots on both ends to secure the coil.

    • Make sure the loose ends are exactly diametrically opposite, i.e. 9 o'clock and 3 o'clock!

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    • Trim off the excess copper wire at the ends so that the length of the coil plus leads is slightly longer than the battery. These leads should be of the same length

    • Consider that each lead has a length and a circumference. Use a paper cutter to fully scrape the insulation from one entire lead. The other lead should be scraped on three-quarters of the circumference, but much like the first lead, along its entire length.

    • Alternatively, you can use scissors or sand paper for scraping off the insulation layer.

    Definitely need a 3rd picture here (it can even be a graphic like used in the handouts) to show clearly what is meant by full scraping on one side and three-quarters on the other side. In fact, from these pictures it looks like you haven't scraped along the FULL length of the leads.

    Procheta Mallik - Reply

    • "Lock" end

    • "Hinge" end

    • Place the safety pin perpendicular to the battery so that the "lock" end of the safety pin touches the terminal of the battery and secure it with a tape.

    • Repeat the above step on the other terminal.

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    • Place two ring magnets on the surface of the battery at the centre.

    • If necessary, use tape to secure the magnets.

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    • Insert the ends of the coil through the "hinge" ends of the safety pins so that the coil aligns directly above the magnets.

    • The coil spins as the whole assembly acts now as a simple DC motor.

    comments by vishal:

    Make the terminals of coil diametrically opposite.

    Procheta Mallik - Reply

    • Not enough turns of coil - use a longer copper wire to make the coil.

    • Safety pins are not firmly secured.

    • Safety pins are not in contact with the battery terminals.

    • Insulation layer not properly scraped off at the ends of the coil.

    • Use a fresh and potent battery.

    • The ends of coil are not long enough to stay and spin in the safety pins.

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    • What is the principle behind the working of the DC motor?

    • How does one make the coil spin faster?

    • How do different gauges of copper wire affect the speed ?

    • Does increasing/decreasing the number of turns of the coil have any effect on the speed?

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    • Use a neodymium magnet in place of ring magnets to make the DC motor.

    • Use an external magnet to speed up or slow down the rotation of the coil.

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Finish Line

Kailash NR

Member since: 05/02/2017

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