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oceywocey ♡

Cards (5)

  • A step up transformer causes the potential difference to ___ and the current to ___.
    increase, decrease
  • Which equation links current (I), power (P) and resistance (R)?
    P = I^2 x R
  • A transmission cable has a power loss of 1.6 x 10^9 W. The current in the cable is 2000A. Calculate the resistance of the table.
    R = P / I^2
    R = ( 1.6 x 10^9 ) / 2000^2
    R = 400 ohms
  • What is the equation which links efficiency, total energy input and useful energy output?
    efficiency = useful energy output / total energy input
  • The total energy input to the National Grid from one power station is 34.2GJ. The National Grid has an efficiency of 0.992. Calculate the useful energy output from this power station to consumers in GJ.
    0.992 = useful energy output / 34.2
    useful energy output = 0.992 x 34.2
    useful energy output = 33.9 GJ