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JSS3: BASIC SCIENCE - 2ND TERM

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The movement of electrons in matter is called Electron Flow, when electron flow occurs, we call the flow Electricity. In wires, electricity moves easily, this is because metals are good conductors of electricity while non-metals are not.

The path which provides for easy flow of electric current for conversion into useful purposes such as lightning and heating is called an Electric Circuit. 

The basic components of electric circuits are:

  1. Source of e.m.f (Battery or generator)
  2. Switch 
  3. Ammeter
  4. Voltmeter
  5. Resistor 
  6. Key 
  • A voltmeter is an instrument used to measure the potential difference of a conductor. The standard metric unit on electric potential difference is the volt(V). It is always connected in parallel across the point at which the p.d is required. 
Symbol for Voltmeter

Symbol for Voltmeter

  • An ammeter is an instrument used to measure the flow of current in a circuit. The unit of current is Ampere (A).   
Ammeter Symbol

Symbol for Ammeter

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