How would I solve the output voltage for these? I don’t know because all the diodes look different. What is the math and formulas used to solve these?

Here is a picture of the circuits.

http://www.flickr.com/photos/22774022@N06/3981573381/

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.

I’m making a proximity sensor circuit and want to use a relay to trigger lights or toy motors or something.

My question is what do I need to know to figure out which relay I need.

I know the voltage and amperage(9v -400mA) of my signal and a rough idea of my main load (one hundred LEDs or 4-5 toy motors). How exactly do manufacturers call these ratings and is there a standard naming convention for relays similar to transistors and diodes? I can;t order online so local electronic shop will have to do.

1 Answer:

In the binary system, the number 145 is represented as
a. 01010101
b. 01101100
c. 10010001
d. 11001001

2 Answer:

The largest number that can be represented by one byte is
a. 240
b. 255
c. 270
d. 285

3 Answer:

The number represented by the byte 00101110 is
a. 30
b. 46
c. 54
d. 86

4 Answer:

An integrated circuit combines diodes and transistors on a thin slice
of
a. arsenic
b. gallium
c. germanium
d. silicon

5 Answer:

The product most responsible for the rapid growth of modern radio and
television technology is the
a. anode
b. biode
c. diode
d. triode

6 Answer:

The product doctors depend on to strengthen weak electric signals from
a patient’s heart is the
a. amplifier
b. rectifier
c. semiconductor
d. transistor

7 Answer:

The electronic device that uses electrons to produce an image on a
screen is called a (an)
a. amplifier
b. cathode-ray tube
c. rectifier
d. transistor

8 Answer:

A positive-type semiconductor is the
a. type X
b. type Y
c. type n
d. type p

9 Answer:

An instrument that does "not" interconvert sound and electric energy
is the
a. pocket calculator
b. radio
c. stereo
d. tape recorder

10 Answer:

The number system consisting of only two numbers is the
a. decimal system
b. unit system
c. metric system
d. binary system

I have a simple serial circuit consisted of a battery, diode, resistor, led and ground (in this order). What is a ground? And what is the right way to connect the components? + to + + to -?

I have over 200 or so non working old NES cartridges and lots of other boards from other electronic what-nots . I broke one open and the fingers and lines seem to be gold. I heard you could recover gold from the boards and stuff, should I remove the flat black boxes and diodes or what-nots or will they melt down and evaporate?

1. If an atom loses one or more electrons, it becomes
A. negatively charged.
B. positively charged.
C. neutrally charged.
D. heavier than before.

2. A __________ is attracted to a positive charge.
A. positive charge
B. neutral charge
C. negative charge
D. nuclear charge

3. Electric force is
A. a force that may be transferred by friction, contact, or induction.
B. an excess or shortage of electrons or protons.
C. a property that causes subatomic particles to attract each other.
D. the repulsion or attraction between electrically charged objects.

4. The amount of charge that produces the field and the distance from the charge determine
A. the size of an electric force.
B. the strength of an electric force.
C. the brightness of an electric field.
D. the weight of an electric force.

5. Static discharge occurs when
A. a pathway through which charges move suddenly forms.
B. two electric charges come in contact with each other.
C. an excess or shortage of electrons occurs.
D. like charges repel and opposite charges attract.

6. Increasing the distance between two objects will
A. cause an excess number of electrons to be present.
B. increase the electric force between the objects.
C. reduce the electric force between the objects.
D. not change the electric force between the objects.

7. In a direct current, electric current flows
A. back and forth.
B. and regularly reverses direction.
C. in one or more directions.
D. only in one direction.

8. __________ is the continuous flow of electric charge.
A. Resistance
B. Electric current
C. A superconductor
D. Voltage

9. Electric current __________ through electrical conductors.
A. flows easily
B. encounters resistance
C. is insulated
D. does not flow

10. Alternating currents
A. cannot flow through conductors.
B. only move in one direction.
C. regularly reverse directions.
D. cannot be insulated.

11. All of the following are good insulators EXCEPT
A. Wood
B. Rubber
C. Copper
D. Plastic

12. Resistance is __________ to the flow of __________.
A. the opposition; protons
B. the opposition; electric charges
C. a conductor; electric charges
D. not related; electric charges

13. A wire must be connected in a loop that includes an energy source in order for
A. a charge to be stopped.
B. a proton to transfer.
C. a photon to form.
D. a charge to flow.

14. If current increases while resistance remains constant, voltage will
A. not change.
B. decrease.
C. increase.
D. be reduced by half.

15. If current decreases while resistance remains constant, the voltage will
A. not change.
B. decrease.
C. increase.
D. be reduced by half.

16. According to __________, a circuit’s __________ is equal to resistance multiplied by current.
A. the law of circuits; total current
B. the law of voltage; voltage
C. Ohm’s law; voltage
D. the law of voltage; charge

17. What voltage source converts chemical energy into electrical energy?
A. Battery
B. Multimeter
C. Flashlight switch
D. Insulators

18. A material’s thickness, length, and temperature affect the material’s
A. amplitude.
B. resistance.
C. conductivity.
D. insulation.

19. What happens if one element stops functioning in a parallel circuit?
A. Devices plugged into electrical outlets will not operate.
B. None of the elements will operate.
C. Only one element will still operate.
D. The rest of the elements will still operate.

20. In what type of circuit does the charge have only one path through which it flows?
A. Flowing circuit
B. Electromagnetic circuit
C. Series circuit
D. Parallel circuit

21. A __________ works when a wire in the center melts if too much current passes through it.
A. Fuse
B. Current blocker
C. Safety
D. Independent circuit

22. An analog signal is produced by
A. encoding information as a string of ones and zeros.
B. not changing the voltage or current in a circuit.
C. continuously changing the voltage or current in a circuit.
D. pulsing a current on and off.

23. A semiconductor is a __________ that conducts current only under certain conditions.
A. high-voltage liquid
B. a crystalline solid
C. diode
D. transistor

24. Vacuum tubes do all of the following EXCEPT
A. Turn a current on or off
B. Change alternating current into direct current
C. Act as a semiconductor
D. Increase the strength of a signal

25. Which of these technologies uses a digital electronic signal?
A. Digital video disc (DVD)
B. Audio cassette tape
C. Video cassette tape
D. AM radio

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

i want something that will exercise the brain. i have one of those electronic things where u have the diodes and stuff and make circuits and crap. but that looks boring. my hobbies are basketball, producing music, parkour and cars. too sunny to play b ball and it's sunny. don't really feel like producing. where the crap am i supposed to learn parkour. what the crap am i supposed to do with my car? fuel cost too much. i don't unnecessarily want to do something relating to my hobbies. just as long as i exercise my brain and imagination.