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TOPIC:  ELECTRICAL ENERGY

CONTENT:

  1. Concept of electron flow.
  2. Circuits- series and parallel.
  3. Ammeter and Voltmeter.
  4. House circuit; fuse and circuit breaker.
  5. 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 detail.

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 consist of a swarm of moving electrons. What causes an 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 the 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 the current flow from the 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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ELECTRICAL CIRCUITS

An electric circuit is a complete path of wires and electrical components through which electric current flows. Electric current can be made to flow from its source through metallic wires, back to its source. Electric current leaves the negatively charged rod of a cell, flows through a wire, and then goes back to the cell through the positively charged rod. This complete path is referred to as electric circuit. This is represented by a sketch or symbol on the paper using the arrow to indicate the flow of electrons.

COMPLETE AND INCOMPLETE CIRCUIT

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