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  • Resistance is a property that resists the flow of electrons in a conductor. It controls the magnitude of the current. The SI unit of resistance is ohm.
  • Ohm’s law: The potential difference across the ends of a resistor is directly proportional to the current through it, provided its temperature remains the same.
  • The resistance of a conductor depends directly on its length, inversely on its area of cross-section, and also on the material of the conductor.
  • The equivalent resistance of several resistors in series is equal to the sum of their individual resistances.
  • The electrical energy dissipated in a resistor is given by W = V × I × t.
  • The unit for power is watt (W). One watt of power is consumed when 1 A of current flows at a potential difference of 1 V.
  • The commercial unit of electrical energy is kilowatt hour (kWh).
  • 1 kWh = 3,600,000 = 3.6 × 106 J.

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