Open and Closed Circuit

Open and Closed Circuit

Science Week 4

Previous Lesson

• In the previous lesson, you have learned how light interacts with different materials. You also learned that optics is the study of refraction which refers to the bending of light as it passes through different materials; reflection which refers to the bouncing back of light when it hits an object; absorption that refers to a material’s taking in of light and not reflecting it back; and transmission that refers to the passing of light through some materials.

• This time you will learn the conditions necessary to make a bulb light up.

Look around

• Look around your house. How many appliances do you see? How many are currently plugged into your wall outlets? Most households have several devices that make use of electricity. The number of appliances that you have at home shows how important electricity is in our everyday lives.

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How electricity flow?

• How does electricity flow to your appliances? Two conditions must be met in order for electricity to flow: first, there must be a source of electricity; second there must be a complete path for the electricity to flow through

Electrical Circuit

• The picture shows an electrical circuit which has four parts: a source, light bulb, wires, and switch

Open Circuit

• An open circuit is one where the continuity has been broken by an interruption in the path for current to flow.

Closed Circuit

• Closed circuit means a complete electrical connection around which current flows or circulates.

Activity 1

• Make/Create electrical circuit according to the diagram.