Physics 0625 · IGCSE · Energy, work and power

Energy, work and power — practice question

Two wind farms provide electrical energy to consumers in different ways. Wind farm 1 sends energy straight to consumers and, for each $1000\,\text{J}$ of energy taken from the wind, $360\,\text{J}$ is delivered to consumers as electrical energy. Wind farm 2 keeps electrical energy in batteries and then supplies energy from the batteries to the consumer. For each $1000\,\text{J}$ of energy taken from the wind, $270\,\text{J}$ is delivered to consumers as electrical energy. Which statement about the two wind farms is correct?

  • AWind farm 1 is less reliable and less efficient than wind farm 2.
  • BWind farm 1 is less reliable but more efficient than wind farm 2.
  • CWind farm 1 is more reliable but less efficient than wind farm 2.
  • DWind farm 1 is more reliable and more efficient than wind farm 2.

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