How to Make a Parallel Circuit

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When connecting electrical devices to a power source, they can be hooked up to make either a series circuit or a parallel circuit. In a parallel circuit, the electrical current flows along several paths, and each individual device is hooked up to its own circuit. The advantage to a parallel circuit is that if one device malfunctions, the flow of electricity will not stop, as it will in a series circuit. Additionally, several devices can be hooked up to the power source at once, without decreasing the overall wattage output. Creating your own parallel circuit is simple, and is thus a great project to perform to be able to see for yourself how electricity works.

Method 1
Method 1 of 2:

Building a Simple Parallel Circuit with Aluminum Foil

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  1. Creating a parallel circuit is an excellent and easy experiment for students learning about electricity. This method of building a parallel circuit is excellent for younger students: they may have limited dexterity, and you may not want them to use sharp tools.
    • If you are making a parallel circuit as part of a lesson plan, it may help to have your students or child make a list of questions, predictions, and hypotheses about what they'll be observing.
  2. The cheapest and most convenient power source for your parallel circuit project is a battery. A 9-volt battery is an excellent choice.
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  3. This is the item that you'll be hooking up to the power source. You can make a parallel circuit with light bulbs (you'll need 2); flashlight bulbs are also a good choice.
  4. Use aluminum foil as your conductor to build this type of parallel circuit. The foil will be used to connect the power source to the loads.
    • Cut the foil into 4 narrow strips: 2 8 in (20 cm) pieces, and 2 4 in (10 cm) pieces. They should be narrow, about the width of a drinking straw.
  5. You're now ready to start hooking up your parallel circuit.
    • Take one of the 8 in (20 cm) strips of foil and connect it to the positive terminal of the battery. [1]
    • Take the other 8 in (20 cm) strip and connect it to the negative terminal of the battery. [2]
  6. You're now ready to connect your loads to the conducting material.
    • Take the 2 shorter 4 in (10 cm) strips and wrap one end of each around the long strip coming off the positive terminal. Place one 4 in (10 cm) strip near the top of the strip, and the other about 3 inches (7.6 cm) down toward the battery. [3]
    • Wrap the loose ends of the shorter strips around your 2 light bulbs. You may find it helpful to secure the strips with electrical tape.
  7. Once you finish connecting all of the elements of the parallel circuit, your lightbulbs should glow.
    • Place the ends of the 2 light bulbs against the 8 in (20 cm) strip of foil that is attached to the negative terminal of the battery.
    • The lightbulbs should now shine brightly!
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Method 2
Method 2 of 2:

Building a Parallel Circuit with Wires and a Switch

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  1. While creating a parallel circuit is not complicated, this method requires you to use wire and a switch; it may be suited for slightly older students.
    • For example, this method will require you to strip wires, but if you lack the necessary tools for this or don't want young ones performing this task, you may prefer to read the method explained above.
  2. You don't need much to complete this project: You need a power source, a conducting material, at least 2 loads (the items which use electricity), and a switch.
    • Use a 9-volt battery as the power source.
    • You'll be using insulated wire as your conducting material. Any kind will work, but copper-wire should be easy to find.
    • You'll be cutting the wire into several pieces, so make sure you have plenty (30–40 inches (76–102 cm) should do it).
    • For the load, use light bulbs or flashlight bulbs.
    • You should be able to find a switch (as well as all of the other materials) at any hardware or home improvement store.
  3. The wire is your conducting material, which will create the circuits between the power source and your leads.
    • Cut the wire into five pieces (between 6–8 inches (15–20 cm) will be fine).
    • Carefully remove approximately 1 ⁄ 2 inch (1.3 cm) of the insulation from both ends of all your wire pieces.
    • Wire strippers are the best tool for removing insulation, but if you don't have these, scissors or wire-cutters will work; just be very careful not to damage the wires.
  4. Attach 1 of the wires to the positive terminal of the battery and wind the other end around the left side of 1 of the lightbulbs.
  5. Take a separate piece of wire and connect it to the negative terminal of the battery. Take the other end of the wire and connect it to the switch.
  6. Using yet another piece of wire, connect it first to the switch, and then wind it around the right side of the first lightbulb.
  7. Take your fourth piece of wire and wind it around the left side of the first lightbulb, and then wind the other end around the left side of the second lightbulb.
  8. Using your remaining piece of wire, wrap 1 end around the right side of the first lightbulb, and the other end around the right side of the second lightbulb.
  9. Flip the switch, and you should see both bulbs light up. Congratulations—you successfully built a parallel circuit!
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  • Question
    How is energy converted into lights?
    Ralph Childers
    Electrical Professional
    Ralph Childers is a master electrician based in the Portland, Oregon area with over 30 years of conducting and teaching electrical work. Ralph received his B.S. in Electrical Engineering from the University of Louisiana at Lafayette and holds an Oregon Journeyman Electrical License as well as electrician licenses in Louisiana and Texas.
    Ralph Childers
    Electrical Professional
    Expert Answer
    Energy is forced through a thin filament that gets hot enough to glow due to the friction of the atoms.
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  • Question
    How do I do this without the bulbs when making a parallel circuit?
    Ralph Childers
    Electrical Professional
    Ralph Childers is a master electrician based in the Portland, Oregon area with over 30 years of conducting and teaching electrical work. Ralph received his B.S. in Electrical Engineering from the University of Louisiana at Lafayette and holds an Oregon Journeyman Electrical License as well as electrician licenses in Louisiana and Texas.
    Ralph Childers
    Electrical Professional
    Expert Answer
    Other devices and components can be used to create parallel circuits instead of bulbs.
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      Tips

      • The circuit will be easier with a battery connector/holder. This will help release the battery if it became old to replace it with a new one.
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      • You may find it helpful to secure all of your connections with electrical tape.
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      References

      1. ↑ http://www.education.com/science-fair/article/parallel/
      2. ↑ http://www.education.com/science-fair/article/parallel/
      3. ↑ http://www.education.com/science-fair/article/parallel/

      About This Article

      Article Summary X

      To make a parallel circuit, first cut 2 8-inch and 2 4-inch strips of aluminum foil, each the width of a straw. Then, connect one 8-inch strip to the positive terminal of a 9-volt battery and the other to the negative terminal. Next, wrap the ends of the 4-inch strips around the 8-inch strip that’s attached to the positive terminal, putting one near the top of the 8-inch strip and the other 3 inches lower, toward the battery. Wrap the loose end of each 4-inch strip around its own lightbulb. You can then complete the circuit by touching the ends of the lightbulbs to the 8-inch strip that’s attached to the negative terminal. For information from our Licensed Electrician reviewer on how to build your circuit with wires and a switch, read on!

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