Philips lighting has produced an LED light bulb that produces 800 lumens (the same amount as a traditional 60 W incandescent)  but uses only 4 watts of power. Calculate the efficiency of the LED light bulb.  You can refer back to the Group Activity for guidance on this problem and the conversion factor between watts and lumens.

3. What are the main applications of using diodes in commercial power supplies such as laptop power supply? Please provide an original response, thank

Short answer. What happens to the resistance of a negative temperature coefficient material if its temperature increases? Use the editor to format your answer Short answer. What is the advantage of a semiconductor device if in the conduction of current there is no voltage drop across it? Use the editor to format your answer Short answer. Why a semiconductor diode is called a non-linear device? Use the editor to format your answer

Do you understand the connection between a diode and an LED and semiconductors? Put the symbol and some background information on a graph?

(b) Measure (using the DVM and oscilloscope) the voltage drop Vc across the capacitor and explain the operation of the circuit.   the voltage drop Vc across the capacitor is 4.61V please explain question b

Do you have any idea what the connection is between a diode and an LED in terms of semiconductors? Place the symbol on the graph, and provide some background information.

1. What are the main components that make up a photoresist? 2. What is a two-component resist? What are the two components? 3. What does the concept of dose involve? 4. What effect does the dose have on the molecular weight of a negativeresist? (Does it cause it to decrease or increase?5. Identify one problem that can arise when positive resist is applied to athermally grown oxide wafer (silicon substrate). How can this problembe resolved?

(c) A 50 Hz sinusoidal AC voltage source of peak value V, = 340 V delivers power to a resistive load of 50 n. (1) Calculate the average power delivered. (i) The AC source is now connected to the load via a full wave diode bridge. The turn-on voltage of the diodes is 0.3 V. Calculate the peak voltage across the load and the average voltage across the load. (ii) Explain how a smoothing capacitor can be used to hold up the voltage across the load. Compare the efficiency of the rectifier with and without the smoothing capacitor. (iv) Define "regulation" as applied to the output voltage of a rectifier and explain why an LR filtered rectifier bridge provides better regulation of the load voltage than an RC filtered rectifier bridge.

1.) Determine voltages across resistance using 1st approximation. 2.) Determine currents across diodes using 2nd approximation. (GaAs diodes)

At 305 °K temperature, the voltage equivalent of temperature of diode is ______________________V. Assume the Boltzmann's constant is 8.62*10-5 eV / K  Answer: