Parallel Circuits for Kids

Have you ever wondered how holiday lights stay lit even if one bulb goes out? The secret lies in parallel circuits! In this hands-on STEM tech activity, kids will learn how electric current travels through separate branches in parallel circuits to keep the light bulbs glowing.

What are Parallel Circuits?

Parallel circuits are electric circuits where the current flows through separate branches or pathways. Unlike a series circuit, if one bulb goes out, the other lights stay on because each bulb has a pathway connected to the power source.

💡Find more electrical engineering activities [here]!

Key Components of Parallel Circuits:

• Battery: The voltage source that provides the energy.
• Light Bulbs: The electrical devices that act as the load in the circuit.
• Wires (Copper Wire or Foil): The conductors that allow the electric current to flow.
• Switch: Used to open or close the circuit to control the flow of electricity.
• Resistor: Controls the amount of current flowing through the circuit.

Grade Level Recommendation: Best for Grades: 3rd to 6th

💡🛑 Learning to make a simple circuit [here] first is an important foundational step before introducing more complex circuits like parallel or series circuits.

Parallel Circuit Supplies:

• 2 or more light bulbs (or flashlight bulbs)
• 1 battery (or battery connector)
• Alligator clip wires or copper wire
• Electrical tape
• Switch (optional)
• Wire strippers (to expose the end of the wire)

🛑 Adult supervision and assistance are required at all times.

How to Build Parallel Circuits for Kids

Step 1: Gather Your Supplies

• Lay out your battery pack, wires, bulbs, and electrical tape.

Step 2: Connect Wires to the Battery

• Attach one red wire to the positive terminal of the battery and one black wire to the negative terminal.

Step 3: Prepare the Wires

• Separate and prepare the wires by stripping their ends (if needed) and ensuring they can connect to the bulbs easily.

Step 4: Branch the Wires

• Split the red wires and black wires into separate branches using electrical tape. Each branch will power one bulb.

Step 5: Connect the Light Bulbs

• Attach one red wire branch to the base of the first bulb and another to the second bulb.
• Attach the black wire branches to the other side of each bulb base.

Step 6: Secure Connections

• Use tape to secure all the connections and make sure the wires are properly attached.

Step 7: Test the Circuit

Connect the battery, and your bulbs should light up! Notice that if one bulb is removed, the other remains lit because electricity can still flow through the other path.

💡 What’s Happening in Parallel Circuits?

• The electric current flows through separate branches to each bulb.
• If one branch is interrupted, the entire circuit doesn’t fail because the current flows through the other pathways.
• The voltage drop across each light bulb remains consistent.
• The sum of the currents in all branches equals the total current supplied by the battery.

⚡ Parallel vs. Series Circuit:

• The electric current travels along a single line through all components in a series circuit. If one bulb goes out, the entire circuit stops working.
• In a parallel circuit, each bulb operates independently on a separate branch.

Real-Life Examples of Parallel Circuits:

• Holiday Lights: Each bulb has a pathway to the power source.
• Flashlights: Multiple LEDs may be arranged in parallel connections.
• Home Wiring: Household electrical devices are connected in parallel circuits for safety and efficiency.

Reflection Questions:

1. What happens if one light bulb burns out in a parallel circuit?
2. How does a switch affect the flow of electricity in each separate branch?
3. What happens to the voltage drop across each bulb in a parallel circuit?

What happens if one light bulb burns out in a parallel circuit?

If one light bulb burns out in a parallel circuit, the other bulbs will stay on because each bulb has a pathway for electricity.
Example: Think of holiday lights—if one bulb goes out, the rest of the string shines brightly!

How does a switch affect the flow of electricity in each separate branch?

A switch can turn the electricity on or off in one branch without affecting the others.
Example: Imagine having separate light switches in your house—turning off one room’s light doesn’t turn off lights in the other rooms.

What happens to the voltage drop across each bulb in a parallel circuit?

In a parallel circuit, each bulb gets the same power from the battery, so they all shine equally bright.
Example: Each bulb has its direct connection to the battery, getting the same energy.

Extension Activities:

Circuit Science Vocabulary:

• Parallel Circuit: A circuit with separate branches for electric current to flow.
• Series Circuit: A circuit with a single line for electricity to travel.
• Switch: Controls the flow of electricity by opening or closing the circuit.
• Battery: A power source that provides energy to the circuit.
• Current Flows: The movement of electrons through the circuit.
• Pathway: The route electricity takes through conductors.
• Voltage Source: The energy provided by the battery to push electrons through the circuit.
• Resistor: A device that reduces the flow rate of electric current.