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Major VersionM

by Vindhya Rai

Introduction

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

Video Overview

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

  1. Follow the steps in this guide DIY Battery Holder - Foam and Spring.
  2. 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. Now identify the polarity of the LEDs. The longer leg is positive.
    • 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.

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

  3. 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. The LED should light up.
    • 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.

  4. 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.
    • 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.

  5. 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. In our case, the LEDs didn't light up when connected in series. Why might that be? In our case, the LEDs didn't light up when connected in series. Why might that be?
    • 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.

    • In our case, the LEDs didn't light up when connected in series. Why might that be?

  6. Components connected in parallel are connected along multiple paths, so the same voltage is applied to each component. Here are two red LEDs connected in parallel. Using wire, connect the positive of one LED to the positive of another LED and the negative of the LED to negative terminal.
    • Components connected in parallel are connected along multiple paths, so the same voltage is applied to each component. Here are two red LEDs connected in parallel.

    • Using wire, connect the positive of one LED to the positive of another LED and the negative of the LED to negative terminal.

  7. Now  connect  the positive and negative battery terminals to the positive and negative terminals of the red LED respectively to complete the circuit. Both LEDs should light up brightly. Both LEDs should light up brightly.
    • Now connect the positive and negative battery terminals to the positive and negative terminals of the red LED respectively to complete the circuit.

    • Both LEDs should light up brightly.

    • 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.

  8. A series connection needs more input voltage with more LEDs. (True/False) Current is exactly half if the same number of LEDs are used in parallel connection compared to series. (True/False)
    • A series connection needs more input voltage with more LEDs. (True/False)

    • Current is exactly half if the same number of LEDs are used in parallel connection compared to series. (True/False)

    • If we use more number of batteries we will be able to light up two LEDs in series. (True/False)

    • Batteries work exactly like LEDs, when connected in series or parallel. (True/False)

    • Household connections are all in series. (True/False)

    • Use the observation table to note down your observations; i.e. whether the LEDs light up in series or in parallel.

    • Try connecting two different colour LEDs in series.

    • Try connecting two different colour LEDs in parallel.

    • Try increasing the number of batteries in series and parallel.

    • To learn variations of electric circuits. Please visit this link Electric Circuits - Basic (Variations).

Finish Line

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Kailash NR

Member since: 05/02/2017

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92 Guides authored

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