Circuit: http://img216.imageshack.us/img216/8508/circuit.png

Questions;
In the above figure, calculate the;
1) Load current,
2) load voltage
3) load power
4) diode power
5) Total power.

Thanks, your help is much appreciated.

What is the full name of an Element starting with Q?
On a circuit board there are labels. For example for resistors it is "R", for diode "D", for capacitor "C" what is "Q" for?

I’m trying to make an LED nightlite in a small size I have basic electronic understanding but am looking for some insight and possibly formulas describing how to make my circuit the LEDs I want to use need 4V and have a 350MA draw I plan on using 6 of these LEDs. presumably I need some sort of device (diode?) that would convert the current from AC to DC and then a resistor/s right?
So if I Use 2 LEDs back to back I would have to have them in parallel wouldn't I with one reversed from the other? or else the circuit would remain closed wouldn't it? An LED/Diode acts as a one way valve from what I understand, so with 2 LEDs in series if the ac switches direction they would either both be closed or both be open wouldn't they?

I’m pretty new to electronics, but i know a but about it. I recently opened up my door bell transmitter (the thing that is outside that u press to make ur door bell ring). its wireless. inside i found the average array of ceramic capacitors and resistors. but there are 3 things i have trouble figuring out. There is somethin that is labeled as d1 (kinda like how resistor is labeled r1,r2,r2 and capacitor is c1,c2, etc.) im guessin this is a diode? not sure. it just makes sense to me. then, there is a blue round thing that kinda resembles an aluminum capacitor but its not. its located near a long metal bar. my guess is that this is the transmitter? and the bar is an antenna? no idea. and final thing is in the center of the circuit board. its like a black drop of some sort of material. its not like an electronic component. it looks like a drop of black glue thats hard and solid. on the underside u can see a bunch of circuits ending under it. my guess is that it connects them all, but that doesnt seem right. i honestly cant figure out wat it could be. sigh… well plz let me know wat all this stuff is. i really wanna build a similar contraption. thnx a lot guys

Basically, I am seeking explanations of circuit operation, schematics, and such like matters for simple camera flash systems (like, for example, the Kodak Star Focus Free camera or the Continental Tele-Flash 350T camera). I tried, for one, going to Kodak but navigating the site became cumbersome when all I need are simple circuit descriptions, parts listings, schematics, etc.). I notice the circuit(s) has (have) what appear(s) to be one bipolar transistor (number D879 3L on the Continental unit and number D879 4D on the Kodak star). Next, the systems include a small valued capacitor, a huge valued one (also, huge in size…350V, 420 uF), a small transformer, a flash (of course), a small indicator light, about three resistors (usually in the Kilohms range and rated at 5% tolerances and most are 1/4 W but one is 1/8 Watt), and some kind of "thing" that I'm uncertain what component it is (a white lead from the gas flash tube leads to it….a coil, maybe????). Anyway, any electronic experts out there that can help? Thanks in advance a bundle.
Oh, I forgot to mention that the usual units I've seen also have one diode in them. One of the samples also has an additional disc capacitor (very very tiny in size) along with the .l uF and 420 uF ones). As you can tell, however, it is basically just a fist full of components.
Oh, I want to extend my deep thanks to each answer. This helps a lot.
Oh, I want to extend my deep thanks to each answer. This helps a lot.

in a circuit are _____?

A- digital signals

B- cathode rays

C- diode signals

D- analog signals

actually i had asked abt functions of a diode in my last question
and i got the answer that diodes usually used to get a single direction current in electronics circuits…now a question is raised in my mind that why we use a single direction current in electronics circuits,,,i mean where ,,,which part of a electronic circuit single direction current is used and why

plz answer with ur best
a big thnx in advance

My Wards food dehydrator doesn't heat any more, and the only thing that I can't check is a small electronic component in line with the heating coil. The fan went bad, and the plastic fan blade melted. After replacing the fan, the heating element won't heat. Thought maybe this is some sort of fuse that blows when it overheats, it looks somewhat like a diode to me (rocket ship shaped). I'm tempted to just short circuit the device, but would prefer to replace it if I knew what it was. I tried measuring the resistance with my meter, and it read open circuit, even switching the leads. Can anyone help me identify this component?

The diode seems to be open (not conducting either way) I would like to find a data sheet on this diode but I can't find a cross reff. to give me the complete part number or manufacture