Find how many LEDs must be combined to give a total of 1.6 W of visible light output and with the efficiency of 20%.

Q: Obtain the Fourier transform of the "switched-on" exponential function shown in Fig. 18.7. f(t) 0…

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Q: Problem 4 For the circuit shown below: a) Use the voltage-division principle to calculate the…

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Q: A circuit comprises a 50 resistor, a 5 mH inductor and a 0.04µF capacitor. Determine, in the…

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Q: (³) d- Р [PA~Y (pv₁] V (PVq₂) V p

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Q: For the op-amp shown in the following figure, if R1 = 100 and Rf 1 k2, the overall voltage gain is…

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Q: Construct a gate circuit using AND, OR, and NOT gates that corresponds one to one with the following…

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Q: 5A V3 O a. 5v1 Ob. 201 www O c. 5v₁ - 492 202 w www Pi V2 2v3 = -2 5v₂ + 2V3 ww = V2 - 2v3 = 4 Od.…

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Q: 1. A 5-kW AC motor has a power factor of 65% lagging when it is connected to a 200-V 50-Hz mains.…

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Q: FInd the Value of V2 in the given circuit

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Q: A transformer supplies power to a feeder that has five customers. Daily maximum demands for these…

A: Introduction: The inverse of the diversity factor is the coincident factor.It is the ratio of the…

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Q: . Find the Laplace transforms of (b) 5e²t - 3e-t (a) 1+2t-t4

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Q: 3. Determine and sketch Vout for one complete cycle. 15 V -15 V 15 V 0 O -15 V Vi Vm TEN 플 Vm 플 T T…

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Q: H AAA Source angular Frequency quality Factor скач 101 L=7005 H W = 20 rad 15 4 =10 recelts W

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Q: Problem 5 Assume a 15 k resistance, a 5 k resistance, and an unknown resistance R in parallel with a…

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Q: Multiply out and simplify to obtain a sum of products: (a) (A + B)(C+B)(D' +B)(ACD' + E)

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Q: The voltage Vo in the circuit shown equals 10Α 5A 200 €r: 2 Ο 200 3 ЗА

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Q: For a certain 12 V zener diode, a 10 mA change in zener current produces a 0.05 V change in zener…

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Q: How much energy does a 10-hp motor deliver in 30 minutes?

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Q: 4. The total capacitance for this circuit is C₁ SF C₂ 10 F C₁ 10 F

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Q: If (211)X = (152)8, then the value of base x is?

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Q: 3. Determine 1₁ and 12 using current division. 12 2010 ent from our this 152 2002

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Q: Determine the difference and product of the signals below, n = 0, x1(n) — x2(n). What is y(4)? x1(n)…

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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).