Problem 2: Transformer circuit 1H R V mains 10 A transformer has a winding that has the equivalent circuit shown in the diagram. The winding is connected to the mains voltage, which has a frequency of 50 Hz and an rms voltage of 230 V. (a) What is the impedance of the transformer winding? Express your answer with magnitude and phase and correct units. (b) What current will flow through the winding? Express your answer as both a phasor and also as a function of time. Hint: You should assume the mains voltage has zero phase. (c) What are the power factor, the real power and the reactive power in the circuit?

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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).