Electronic Circuits Workshop Snap Circuits

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Copyright University of Colorado Colorado Springs, 2011. For permission to use these materials, contact the Director at the Center for STEM Education, (719) 255-3595. Curriculum format design adapted from CDIO developed by MIT.

Electronic Circuits Workshop – Snap Circuits

LEARNING GOALS: After the completion of this workshop, students will understand:

1. The basic components of an electronic circuit

2. How these components work within Ohm’s Law to do work

3. How to build different types of circuits to accomplish particular tasks

CONCEIVE – What do I wish to accomplish through this project?

This stage involves guiding students in defining the goals of the project, then helping them develop

conceptual, technical and action plans to meet those goals while considering the technology, knowledge, and skills that apply. This guidance is provided in the form of Essential Questions that use student’s

preconceptions, and misperceptions then move them toward a deeper and more realistic understanding of the process and skills needed to complete the project.

ESSENTIAL QUESTIONS:

1. What do all those little parts in an electronic gadget do?

2. Can I predict what a circuit will do based on the parts that are present? 3. Can I build a circuit that accomplishes a task that I want it to?

NOTES:

In this workshop, students will use Snap Circuits to learn the function and role of resistors, capacitors, transistors, motors, and circuits. Students will take this knowledge and build circuits from directions included in the kit and build a circuit of their own design.

5 min: To start, ask students what they know about electricity, electronics, and circuits. Use the information

from How does a circuit work? http://science.howstuffworks.com/environmental/energy/circuit1.htm to correct any misperceptions.

Big, Take Home Ideas for Students:

1. Flowing electrons make up electrical current

2. What Ohm’s law is and what voltage and current are

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5 min: Ask students: “Did you know there are different types of circuits?” Have them share their ideas. Use

the information from “Types of Circuits”

http://science.howstuffworks.com/environmental/energy/circuit2.htm to correct any misperceptions.

Big Take Home Ideas for Students:

1. The difference between a closed and open circuit 2. The difference between a series and parallel circuit 3. What a short circuit is

5 min: Ask students: “What is an electronic circuit?” Have them share their ideas. Next ask: “Do you know

what all those little parts in an electronic device do?” Have them share their ideas. Additionally have an opened device (i.e. remote control, CD player, radio) to use as a prop on hand. Probably, not very many students will know the components. Use the information from “Electronic Circuits” -

http://science.howstuffworks.com/environmental/energy/circuit5.htm. The big ideas

Basic components of a circuit:

1. Resistor

a. Resistors are used to produce heat, as in an electric toaster or furnace; to produce light, as in an incandescent light bulb; to regulate the electric power entering a device, as in a light dimmer or radio volume control; and to set voltages within an electric circuit.

2. Capacitor

a. A device whose principal electric property is the ability to store an electric charge. They are important components in many kinds of electrical equipment, including radio and television transmitters and receivers, some automobile ignition systems, and some types of motors. b. The ability of a capacitor to store an electric charge is useful in controlling the flow of an

electric current.

c.

Another use of capacitors is in circuits that filter electrical signals. A capacitor whose capacitance can be varied is used in the tuning circuit of radio and television receivers. Varying the capacitance changes the resonant frequency of the tuner circuit so that it matches the frequency of the desired station or channel, filtering out signals of all other frequencies.

3. Transistor

a. A transistor regulates current or voltage flow and acts as a switch or gate for electronic signals.

b. A small change in the current or voltage at the inner semiconductor layer (which acts as the control electrode) produces a large, rapid change in the current passing through the entire component. The component can thus act as a switch, opening and closing an electronic gate many times per second.

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c.

Transistors are the basic elements in integrated circuits (ICs), which consist of very large numbers of transistors interconnected with circuitry and baked into a single silicon microchip or "chip."

DESIGN - How will I accomplish the project?

After sharing the basics of electric circuits, follow the following agenda that will lead the students through the design process of using the snap circuit kits, constructing circuits in series with resistance and added battery power. By starting with constructing these initial circuit designs they will understand reverse polarity, how they control speeds and then they will introduce an integrated circuit.

1. Instructor explains how to build projects with the kit (Grid, Layers).

2. Students construct an electric circuit in series with a motor and fan (Project #11).

3. Students construct an electric circuit in series with a resistor, motor, and fan (Project #12). Note and discuss the impact to the fan speed.

4. Instructor demonstrates an electric circuit in series with two battery packs, motor, and fan. Note and discuss the impact to the fan speed.

5. Students construct an electric circuit in parallel with a resistor, motor, and fan (Project #6 with motor polarity reversed). Note and discuss the impact to the fan speed.

6. Students construct an electric circuit using an integrated circuit (Project #53). 7. Instructor demonstrates an electric circuit that produces an AM radio.

IMPLEMENT - From an idea to a product!

Have students select and construct a project of their choosing. They can modify a project in the instruction manual but encouraging them to experiment.

OPERATE – Does it work the way I planned?

Have students demonstrate their project and discuss how the circuit design works. Did it accomplish the task or initial design the envisioned?

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RESOURCES NEEDED – What equipment and supplies do I need?

Elenco Snap Circuit kits use building blocks with snaps to construct electronic circuits where a manual is provided with many different project circuit diagrams. These are real working circuits just like the circuits found in today’s modern technology that we find ourselves using regularly including video games and cell phones. For more information http://www.elenco.com/snapcircuits.html

SET-UP

1. Have complete kits ready with fresh batteries.

2. Have instructions available for Project #11, #12, #6, and #53. (see attached).

Note: If you have limited time availability for this workshop, have the above projects pre-built for students to explore.

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Colorado State Standards – High School

21

st

Century Skills

1. Physical Science Concepts and skills students master:

5. Energy exists in many forms such as mechanical, chemical, electrical, radiant, thermal, and nuclear, that can be

quantified and experimentally determined

6. When energy changes form, it is neither created not destroyed; however, because some is necessarily lost as heat, the amount of energy available to do work decreases

Evidence Outcomes

Students can:

b. Evaluate the energy conversion efficiency of a variety of energy transformations

Inquiry Questions:

3.Scientists or engineers often say energy is “lost.” Is there a word that might be better than “lost?” Why?

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Copyright University of Colorado Colorado Springs, 2011. For permission to use these materials, contact the Director at the Center for STEM Education, (719) 255-3595. Curriculum format design adapted from CDIO developed by MIT.

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