| Intermediate Technology Education | Energy and Power Technology | Pre-Design | Topic 3 | Activity 8 |

Electricity

Electrical Resistance

  • What is electrical resistance?
  • What are the electrical properties of
    • conductors
    • insulators
    • semiconductors
  • What is the unit of electrical resistance?  What symbol is used to represent this unit?
  • How are EMF (voltage), current (amps), and resistance related? Who is this relationship named after?
  • Suppose that your lamp operates at 120 volts, and uses a 50 watt bulb.  How much current does it use?

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Electrical Power

  • What is the relationship of EMF and current, with respect to electrical power?
  • Is electrical power different than mechanical power?
  • What is the unit of measure for electric power?
  • What is the relationship of time to units of electric power?
  • Examine 3 electric appliances and determine the following (some information will be on labels, some you may have to calculate
    • Voltage they use
    • Electric current they use
    • Electric power they consume

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