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What is Resistance?

What is Resistance?. What is Resistance?. The opposition to the flow of an electric current, producing heat . The greater the resistance, the less current gets through. Good conductors have low resistance. Measured in ohms.

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What is Resistance?

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  1. What is Resistance? www.assignmentpoint.com

  2. What is Resistance? • The opposition to the flow of an electric current, producing heat. • The greater the resistance, the less current gets through. • Good conductors have low resistance. • Measured in ohms. www.assignmentpoint.com

  3. Resistance is the opposition that a substance offers to the flow of electric  current.  • It is represented by the uppercase letter R.  The standard unit of resistance is the ohm, sometimes written out as a word, and sometimes symbolized by the uppercase Greek letter omega: Ω www.assignmentpoint.com

  4. When an electric current of one ampere passes through a component across which a potential difference (voltage) of one volt exists, then the resistance of that component is one ohm. (For more discussion of the relationship among current, resistance and voltage, see Ohm's law.) www.assignmentpoint.com

  5. What Influences Resistance? • Material of wire – aluminum and copper have low resistance • Thickness – the thicker the wire the lower the resistance • Length – shorter wire has lower resistance • Temperature – lower temperature has lower resistance www.assignmentpoint.com

  6. The electrical resistance per unit length, area, or volume of a substance is known as resistivity. Resistivity figures are often specified for copper and aluminum wire, in ohms per kilometer. www.assignmentpoint.com

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