Power Semiconductor Diodes

Question on semiconductor LED?

A blue semiconductor LED is connected in series with a 10 Ω series resistor to a voltage source. The LED emits 4.03 x 10^16 photons/s at a wavelength of 400 nm. The current flowing through the LED is 40 mA and the voltage across the LED is 3.5 V. What would be the power conversion efficiency of the diode.

TKS a lot for your help!!!

The energy of a photon, E, is

E = hc/l,
c = 2.998 × 108 m/s = the speed of light
h = 6.626 × 10-34 joule·s = Planck's Constant
l = wavelength

Total emitted energy EE is then 4.03 * 10^16 * E

Power conversion efficiency = EE/(3.5*0.04)

Please put in the numbers.

http://pvcdrom.pveducation.org/SUNLIGHT/PENERGY.HTM

http://pvcdrom.pveducation.org/APPEND/Constant.htm

.

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High Power Diode Laser 35 W @ 915 nm paperboad burning

Electronic components.?

What are the following and what are their applications?
Power supply
Trnsformers
Modems
PLL
VCO
SEMICONDUCTORS
TRANSISTORS
DIODES
Thanks Gabe

Power supply: Typically converts AC (alternating current) power from an outlet to DC (direct current) power. In general, converts power from one form into a form that is usable by a device's circuits.

Transformers: Converts an AC voltage from one voltage to another voltage using two sets of coils wound around a common magnetic (typically iron) ring.

Modems: This stands for modulator/demodulator. It converts signals to be sent, either digital or analog, into signals that can be transmitted over a network (a.k.a. modulated), and receives sent signals that were modulated by demodulating them. The common high-pitch whine of a modem (if you pick up a phone line while it's in use) is a series of bytes being turned into frequencies that can be transmitted over a phone line, because a phone line can only transmit frequencies, not constant voltages.

PLL: Phase locked loop. These are used all over the place for way too many purposes to list here. A main purpose is to detect a frequency within a signal.

VCO: Voltage controlled oscillator. These are used to generate frequencies. For telecommunication, these produce tones that we can here.

Semiconductors: These are electronic components that use a special property of some materials. They are neither conductors nor insulators. Rather, by applying electric fields and small currents, they can be made to conduct, by modifying the energy levels in the electron shells of the atoms that make up the material. Silicon is the most commonly used semiconductor.

Transistors: These are a semiconductor device. They have three wires (pins) coming out of them. By applying a small current between two of the pins, one is able to control a larger current through the third pin.

Diodes: These are also semiconductor devices. They have two pins coming out of them. They have the special property that electrical current can only flow one direction through them.