electricity mindmap

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  • introduction to electrical current
    • current,resistance and ohms law
      • current is measured of rate of flow of electrical charge through a circuit. a larger current means faster flow
      • current can change by increasing and decreasing the potential difference of the circuit.
        • components can reduce the size of current called resistance.
          • all elements in a circle include wires, resistance current
            • resistance is measured of how hard it is for charge to flow round electrical current.
      • ohms law
        • the connection between current was discovered by Georg ohm in 1827. (voltage/resistance)
        • the formula V=I*R is known as ohms law. represented by the symbol
          • ohms law is normally written potential difference= current*resistance or V=I*R
            • resistance measured in ohms current is measured in amps and potential difference is measured in volts.
    • experimenting with resistance
      • resistance of wire depends on factors,material,thickness,length and temprature.
        • if the length of the wire increases the resistance increases. if the thickness of the wire increases the resistance decreases
          • in parrell circuits if the resistores are connected in parrell the total resistance of the circuit reduced.
            • in series circuits if resistors are connected in series the total resistance of the circuit increases.
              • equation to calculate resistance is R=V/I.


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