Lesson Plan of Types of Electric Circuits (Parallel & Series Circuits)
General Science Grade VII
Students’ Learning Outcomes
· Define current.
· Make parallel and series circuit.
· Investigate about types of circuits, used for different purposes.
· Identify the disadvantages of series circuit.
Information for Teachers
· Electric Current: Flow of electrons passing through a conductor per second is called electric current. It is measured in Amperes (A) or mille ampere (mA).
· Circuit: The path followed by the current is called circuit.
· Basic components: Basic components for an electric circuit are battery, key/switch, bulb and connecting wires.
· The electric components may be connected in two ways; series combination and parallel combination.
· The types of circuit: There are basically three types of circuit 1. Series, 2 parallel, 3 series and parallel circuit.
· Series circuit: in a series circuit, charge has only one path through which it can flow. If one bulb burns out in a series circuit, it becomes an open circuit. The bulb in series circuit is a source of resistance. Adding bulbs to a series circuit increases the resistance. The current decreases and each bulb shine less brightly.
Material / Resources
Dry cell (1.5V), cell holder, electric bulb, bulb holder, connecting wires and switch
Worm up activity
Development
Sum up / Conclusion
Q1. What is series circuit?
(Expected response: When two or more bulbs are connected one after the other in such a way that
A same current flow through all the bulbs is called series circuit.
Q2. What is parallel circuit?
(Expected response: When two or more bulbs are connected to each other in such a way that the
Current flows through different paths are called parallel circuit).
· When the circuit is open (either by opening the key, broken wire, fused bulb or exhausted cell) the bulb doesn’t glow.
· The current flows only when the circuit is closed.
Assessment
1. What is the function of a switch?
(Expected response: To open or close the circuit)
2. Name the source of electrical energy in the circuit.
(Expected response: Cell or battery)
3. Metal wires are used as connecting wires. Why?
(Expected response: Metals are good conductor of electricity)
4. Name the electrical equipment in the house.
(Expected response: Bulb, Tube light, Fan, T.V., Computer, Air conditioner)
Follow up
· Draw circuit diagrams to connect three bulbs in various ways and observe the characteristics.
