You are building an off grid house fitted with solar panels and a battery bank. The house operates at 120V and uses 20kWh of energy per day. The battery needs to be able to store an entire day of electricity. What should be the capacity of the battery in Ah? Assume the battery has a round trip efficiency of 87%. Please show your work!

Q: 20 V

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Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).