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Experiment to test the effect of varying light intensity on the power output of a solar cell PLANNING Theoretical Background. Photovoltaic (solar) cells are cells that generate an electromotive force (EMF) and therefore provide a current without a battery. The cell consists of a junction between two different materials, often p-type silicon and n-type silicon and light of certain wavelengths is able to ionise the atoms in the silicon. The junction allows the ionised electrons to spontaneously drift from one material to the other. This causes an overall positive charge to build up in the material losing electrons and a negative charge in the material gaining electrons. The electromagnetic radiation (light) gives the electrons enough kinetic energy to move freely and a current within the circuit is produced. Diagram to show the photovoltaic effect in a solar cell What effects power output of a cell? The amount of power available from a photovoltaic device will depend on: * The...

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