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Unit 10 P3

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P3 – Describe the operation and an application of a solar power source.
A solar cell also known as photoelectric cell, is a device that alters light energy into electrical energy. One solar cell creates a really small amount of energy (around about 0.6 volts DC) so they are normally placed alongside each other inside an integrated electrical panel known as a solar panel. We are not completely aware of how sunlight is fully converted into electricity and thus we can only convert a small part of the light energy to electrical energy. The current generation of solar cells convert only a small percentage (12 to 15%) of the light energy from the sun into electrical energy which we can use.
A solar cell is based upon the “photo-electric effect” which …show more content…
Initial Voltage It can be 9 volts or 1.5 volts.
Capacity There is no standard for the capacitance of alkaline batteries.
Discharge Rate Sloping. Items which use a high amount of current are very bad for batteries as they use up more current thus causing the discharging slope to be sharper.
Internal Resistance Very low. It remains almost the same up until near the end of its life where it will increase promptly.
Impedance Very low (considerably less than carbon zinc batteries).
Storage Life Up to 10 years.
Storage Temperature 15°C (59°F)
Disposal They are not recyclable but can be safely thrown away.

Nickel Metal Hydride Batteries:
Nickel-metal-hydride batteries are similar to nickel-cadmium batteries and their only difference is that instead of cadmium, hydrogen is used with a hydrogen-absorbing negative electrode (anode) thus the hydride part of the name. This electrode is normally a metal hydride which is typically an alloy of Lanthanum and rare earths that act as a source of reduced hydrogen that form protons when oxidised. The electrolyte is normally alkaline potassium hydroxide and its cell voltage is 1.2V. The basics of the nickel-metal hydride cell with a negative electrode originates from research on alternative energy sources. Experiments showed that some metallic alloys form hydrides that can catch and discharge hydrogen in large quantities almost a thousand times their own amount. A NiMH batteries is made up of a cathode made of Nickel-hydroxide and an anode of Hydrogen absorbing alloys alongside a Potassium-hydroxide (KOH)

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