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  • Created by: Sevdeg
  • Created on: 11-05-14 12:24
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  • Electric current, potential difference and resistance
    • Conventional current is from positive to negative. But electrons in the metal wire move from negative to positive.
    • Current (A): Charge (C)/ Time (t)
    • Voltmeter placed across the power supply measures the emf of the supply, whereas the voltmeters placed across resistors measure the P.D.
      • P.D: Work done per unit charge. When charges lose energy by transferring electrical energy to other forms.
      • E.M.F: Energy converted from chemical to electrical when charge flows through cell.
    • * Greater PD, greater current
    • *Greater resistance, smaller current
    • The ohm is the resistance of a component when a PD of 1 volt drives a current of 1 A through it.
    • To determine the R of a material we connect the voltmeter parallel to the material.
    • Power= Energy transferred/ time
      • Energy= Voltage*Charge
    • Power=VI Power=I^2R Power=V^2/R
    • Energy=IVt


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