大象传媒

  • Sustainable energy

    • Energy - OCR 21st Century

      Power is the rate at which energy is transferred. The amount of energy usefully transferred in a system determines how efficient that system is.

    • Electricity generation - OCR 21st Century

      Every person, animal and device transfers energy. Much of the energy that is supplied by electricity must be generated from other energy stores - some are renewable but most are non-renewable.

    • Sample exam questions - sustainable energy - OCR 21st Century

      Understanding how to approach exam questions helps boost exam performance. Questions will include multiple choice, descriptions and explanations, using mathematical skills and extended writing.

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