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by Procheta Mallik

Introduction

Make a simple circuit using batteries, LEDs and a switch. Explore making and observing parallel and series circuits.

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

    • Be mindful of the battery terminals, they can heat up or momentarily spark if an electrical short occurs.

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  1. Take 2 connecting wires and strip the insulation on both ends.
    • Take 2 connecting wires and strip the insulation on both ends.

    • Now run the exposed wire end through one of the holes in the battery holder terminals.

    • Loop it back on itself and twist the wire to secure it.

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    • Here we see a circuit diagram which is a graphical representation of an electrical circuit. The highlighted object is an electronic symbol for an LED. The long line on one side indicates the negative terminal of the LED.

    • Now identify the polarity of the LEDs. The longer leg is positive.

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    • Connect the positive wire from the battery holder to the positive leg of the LED and the negative wire to the negative leg. The LED should light up.

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    • Components connected in series are connected along a single path, so the same current flows through all of the components. Here the two Red LEDs are connected in series.

    • In order to achieve this, start by identifying the pins of both LEDs.

    • Connect wires to the terminals of one LED and connect the negative terminal of the first LED to the positive terminal of the other.

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    • Now connect the positive terminal of the first LED to the positive of the battery and the negative of the second LED to the negative of the battery.

    • The LEDs should begin to glow very dimly.

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    • Components connected in parallel are connected along multiple paths, so the same voltage is applied to each component. Here the red and green LED are connected in parallel.

    • Using wire, connect the positive of the red LED to the positive of the green LED and the negative of the red to the negative of the green.

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    • Now connect the positive and negative battery terminals to the positive and negative terminals of the red or green LED respectively to complete the circuit.

    • Both LEDs should light up brightly.

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    • If the battery holder refuses to light an LED, check the contact between the LED pins and wires.

    • Be careful not to short the terminals of the batteries. If the batteries heat up while in the holder, this could indicate an electrical short circuit. Remove the batteries and check your connections.

    • If the LEDs don't glow in the series connection only, the batteries maybe partially depleted. Try again with a new set of batteries.

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Finish Line

Kailash NR

Member since: 05/02/2017

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