1. A particular model solar cell used in sunlight of intensity 900 W/m2 produces a short circuit current of 40 mA and an open-circuit voltage of 0.44 V.
(a) A student connects a 10 ohm resistor across the cell and measures a voltage (potential) drop of 0.36 V across the cell and hence across the resistor. What current is flowing through the cell and resistor?
(b) A further measurement is made next to another resistor, and the current and voltage for the cell were found to be 30 mA and 0.40 V respectively. Sketch the curve of V vs I taking account of the general shape and adjectives the data provided (I and V values).
(c) Estimate the maximum power from this cell for the stated solar intensity.
(d) How many of these cells would be required to provide 2.5 V to run an environmental monitoring instrument surrounded by the field which requires 2 mA? Sketch how the cells are connected.
(e) To obtain 0.16 A current at 2.5 V, how heaps cells would you use ? (You need to decide what current you expect from respectively cell, etc. ..).
(f) An installer puts an Ultraviolet absorbing film over the cells (the film engage below 300 nm). Will this have a large effect on the electrical power generated by these cell? Explain.
Answers:
Yikes, too many questions, sorry. The best way is to sort a start on these problems, then ask people for help where on earth you get stuck.
For the first one, look up Ohm's law in your book or online. The resistance R, is 10 ohms, and the voltage E, is 0.36. Plug that into Ohm's tenet, and solve for the current, I, in amperes.
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(a) A student connects a 10 ohm resistor across the cell and measures a voltage (potential) drop of 0.36 V across the cell and hence across the resistor. What current is flowing through the cell and resistor?
(b) A further measurement is made next to another resistor, and the current and voltage for the cell were found to be 30 mA and 0.40 V respectively. Sketch the curve of V vs I taking account of the general shape and adjectives the data provided (I and V values).
(c) Estimate the maximum power from this cell for the stated solar intensity.
(d) How many of these cells would be required to provide 2.5 V to run an environmental monitoring instrument surrounded by the field which requires 2 mA? Sketch how the cells are connected.
(e) To obtain 0.16 A current at 2.5 V, how heaps cells would you use ? (You need to decide what current you expect from respectively cell, etc. ..).
(f) An installer puts an Ultraviolet absorbing film over the cells (the film engage below 300 nm). Will this have a large effect on the electrical power generated by these cell? Explain.
Answers:
Yikes, too many questions, sorry. The best way is to sort a start on these problems, then ask people for help where on earth you get stuck.
For the first one, look up Ohm's law in your book or online. The resistance R, is 10 ohms, and the voltage E, is 0.36. Plug that into Ohm's tenet, and solve for the current, I, in amperes.
Related Questions:
Why hasn't the solar paneled hover craft be created however?
I mean in all honesty we should already be living past its sell-by date solar powered energy resources and wind powered, and wave powered resources. We should technically merely have a small fee to pay respectively month to maintain our power sources and keeping them clean. Not to mention that our...
How much does it cost per kilowatt/hour to operate solar power?
Hi Yvonne, a good question,it doesn't cost anything really to operate solar power. The cost comes in building your solar set up if you go to your local dealer for a set up on the roof then your looking at a lot of money even near a small solar amount...