Electricity - Section 6 AQA

HideShow resource information
  • Created by: Alicia_H
  • Created on: 16-10-16 08:17
View mindmap
  • Electricity
    • Current
      • I=Q/t
        • I=Current (A,Amps)
          • Measured using ammeter in series
            • Ammeter = zero resistance
        • Q=Charge (C,Coulomb)
          • The rate of flow of electrons
        • t=Time (s,seconds)
    • Potential Difference
      • V=W/Q
        • V=Voltage  (V,Volts)
          • 1V=1J/C
          • Measured using Voltmeter in parallel
            • Voltmeter = infinitely resistant
        • Q=Charge (C,Coulomb)
        • W=Work done (J,Joules)
    • Resistance
      • R=V/I
        • I=Current (A,Amps)
        • R=Resistance (?, ohms)
          • Ohmic Conductors
            • Ohms Law: Provided physical conditions remain constant the current through an ohmic conductor is directly proportional to the current through it
            • I is directly proportional to V
            • Graph is a straight line through the origin
          • Resistors
            • Variable Resistor
              • Resistance can be varied
            • Thermistor
              • Resistance decreases as temperature increases
        • V=Voltage (V,Volts)
      • Resistivity
        • resistivity =(RA)/l
          • l=Length (m,metres)
          • R=Resistance (?, Ohms)
          • Resistivity     (?m, ohm-meters)
          • A=cross-sectional area (m2)
        • Super-conductors
          • Zero Resistivity
          • Uses:     Power Cables Electromagnet Fast Circuits
    • Power
      • P=VI
      • P=I²R
    • Electrical Energy
      • E=VIt
    • E.m.f and Internal Resistance
      • emf=E/Q
        • emf=I(R+r)

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Work, Energy, Power resources »