Friday 15 June 2012

The Last Post

Today we learned about electrical power, and got some formulas:

P=VI,   P = V^2 / R,   and P = I^2 / R

The SI unit for Power is Watts.

We also learned about power rating, and how to read an electric meter.

We also got steps to find electrical cost:

  • Find power and convert to kW
  • find hours
  • multiply time by power
  • multiply by rate.
Electrical sefety

We learned:
  • all voltages are dangerous
  • AC is more dangerous than DC
  • Electrical shock is a jarring shaking sensations that can cause burns.

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