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WEEK FIVE
TOPIC: ELECTRICAL ENERGY
CONTENT:
- Concept of electron flow.
- Circuits- series and parallel.
- Ammeter and Voltmeter.
- House circuit; fuse and circuit breaker.
- Electric meter- reading and billing.
PREAMBLE:
We already know various forms of energy. Can you mention them? Today, we are going to learn about Electrical energy in details.
Now, what is electrical energy?
Introduction: We make use of electricity in our towns and some villages, homes; schools etc. electricity is used for lighting, heating and cooling and in our industries. This electrical energy is the energy derived from the flow of electrons which is known as electric current.
How does electron flow, are there types of flow, how and with which device do we measure the flow, what is electrical circuit, how do we prevent the hazards, and read meter and billing system.
CONCEPT OF ELECTRON FLOW
In an electric flow, the current consists of a swarm of moving electrons. What causes electric current to flow is a chemical device called electric cells. Electric do this by producing an electric force which pushes the current along, and current will only flow if there is a complete circuit of conductors, by which the current will leave from one end of the cell and travel round to the other end. The current is the same at any point round the circuit and if the conductor is broken at any point, the current will stop flowing. Note that current flow at negatively charged end to the positively charged end. DEMONSTRATE an activity using unripe orange with zinc and copper plate; repeat the experiment using dilute sulphuric acid in a beaker.
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