Home Electronics

Here's the give out, look up an "LED throwie" and you'll see basically whats going on here.

You connect an LED to a 3v coin cell battery and it lights up. Intelligible, anode to + and cathode to -

Lights for about a week. I figured I could add an el cheapo photoresistor to the anode and it would dim the LED during the day, and run it normally at nightfall, thereby increasing the battery life.

Pretty much making a kids nightlight but with a battery instead of plug in. The problem Im having though is that its working regressively. As in, when I cover up the photocell the LED dims, when I put it in the sunlight, the LED gets brighter. As I understood it, you just reverse the photocell and it will act the vis- way, getting brighter at night. However no matter how I arrange the photocell, it ALWAYS makes the LED brighter in sunlight. I hunger the opposite. I got some photocells and a phototransistor and they are both acting the same. My photocell (PhotoREsistor) is behaving like a photoTRANSistor.

No subject how I arrange it, its getting brighter in the light. What am I doing wrong?!

2009-08-07 15:21:39 by M

Also cellphones, receptacle pc, PDA, palm, smartphones. This is a risk and danger if the battery is to explode due to a manufacturer's desert or ...

Dell Insprion 530 E5300 2.6GHz

Processor & Recollection:
Intel® Pentium® Dual-Core Processor E5300 at 2.6GHz
2MB L2 Cache
800MHz Front Side Bus
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16x DVD±RW Drive

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Dell 22" Wide S2209WFP Invigilator
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Integrated NIC Card

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Dell USB Keyboard
Dell 6-Button Laser mouse

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1 x PCIe x16
1 x PCIe x1
2 x PCI

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300 Watt DC Power Rig out
Backup battery: 3-V CR2032 lithium coin cell

2009-06-17 20:37:11 by banana

Price: $9.38 $8.15

1.Invent a diagram of your electroplating apparatus (an electrolytic cell). Then submit your drawing with the following terms labeled correctly. Or, inception with the positive terminal of the battery and ending with the negative terminal of the battery, describe the path that the electricity takes and where each of the following occurs:
•anode
•cathode
•copper pillage
•battery
•positive terminal
•negative terminal
•place where oxidation occurs
•place where reduction occurs
•electrolyte key
•coin (or nail)
•direction of electron flow



Please can someone just draw me this and label the parts! You will get an easy 10 points
:)

My representation won't show up. I will have to email it to you.

2009-05-29 18:54:56 by Haha Yoo

Price: $2.99 $3.81

Outfit ideal temperature resistance and superior storage capacity
Designed to yield optimal performance throughout the life of the battery

1. Of the metals Ni, Au, Hg, and Ag, which will give up its electrons to copper (Cu) in a redox effect?

Ni

Au

Hg

Ag


3. Which of the following reactions would occur at the anode in a voltaic cell?

K+ (aq) + e K (s)

Cd2+ (aq) + Zn (s) Zn2+ (aq) + Cd (s)

Cu2+ (aq) + 2e Cu (s)

Ca (s) Ca2+ + 2e



4. Why was it consequential to polish the copper strips and wire, the coin, and the nail in the electroplating experiment?

You need to apply a layer of iron to the integument of each material.

You need to remove a layer of copper from the surface of each material.

You need to heat up the covering of each material by friction to get the reaction going.

You need to have a clean surface for contact between the solution and the secular.


6. In an electroplating apparatus, where does the reduction reaction occur?

on the surface of the anode

in the solution

on the covering of the battery

on the surface of the cathode



7. Here is the overall reaction of a mercury oxide dry cell:
Zn + HgO ----> ZnO + Hg. In this reaction, which of the following gets reduced?

Hg

O

Zn

HgO



8. In which of the following combinations would you shortage an electroplating apparatus to coat the first metal onto the second metal?

aluminum onto lead (Pb)

cadmium onto nickel

tin (Sn) onto copper

nickel onto iron



9. In an electroplating requisites, where does the oxidation reaction occur?

on the surface of the cathode

in the solution

on the surface of the battery

on the surface of the anode



10. Which of the following statements is not loyal for an electrochemical cell?

An oxidation-reduction reaction must occur.

Electrons must flow through a separate path from the retaliation solutions.

Nonparticipating ions must flow to keep the electrons electrically neutral.

The metals that form the electrodes must be twin.



11. Of the metals Li, Al, Na, and K, which will not spontaneously donate electrons to magnesium (Mg)?

Li

Al

Na

K

1.
2. b
3.d
4.you demand clean surface, objects oxidize on their own so you need to remove the oxidized layer on top before you do an electrolysis investigate.
6. Cathode (heres how u remember AN OX and RED CAT)
7. Hg
8. tin onto nickel (educated guess)
9.anode
10. b (by process of elimination)
11. dunno

2009-05-15 09:46:06 by little dragon

4. A shaft of white light shines through a blue filter. Use the words transmitted and absorbed to explain what happens to the colours in the virginal light?

7. Why is the method of creating colours by mixing various coloured paints called subtraction?

8. Theorize green light is shone into your eyes.
a) How do you see green light.
b) Suppose a red light and a green brighten are shone together into your eyes. Predict what colours you would see. Which type of cone cell would not be detecting a colour.

PG 137

4. Why do you hear roar after you see the lightening in a far off storm?

5. Light is one type of electromagnetic radiation. Name 3 others?

7. Using your knowledge of sound and illumination, write a paragraph outlining the similarities and differences between them?

11. A string telephone can be made from 2 metal cans and some train. Suggest why -
a) the telephone works only when the string is stretched tight.
b) the telephone does not work when a third person touches the throw one's weight around be in control.

Chapter 12 PG 260

2.
a) Why is it that some appliances have a three-pin plug and some have a two-pin plug?
b) Suppose a toaster has a metal case. Would you reckon on it to have a three-pin plug or a two-pin plug? Explain.
c) To which part of the toaster would you expect the earth wire to be connected.

3) What is the meaning of the add up 15 marked on a fuse or a circuit-breaker?

4) What would happen if the active wire in a double-insulated hairdryer touched the paste case?

5) Light circuits usually have an 8 amp circuit-breaker, and power circuits a 15 amp one.
a) What might chance if you put an 8 amp circuit-breaker in a power circuit.
b) What might happen if you put a 15 amp circuit-breaker in a light circumference.
c) What mistake would be more dangerous, a) or b)? Why?

6) Stupid Sparky said:' fix a broken car fuse with anything - a nail, a piece of wire or a coin. It's too much impose on to get the proper fuses. And they don't blow again when you put thick wire or nails in them.' Explain why Stupid Sparky is being so Stupid?

PG 267

4) An moving blanket connected to the household 240 volt supply has a current of 0.5 amps flowing through it. What is the obstruction of the heating element in the blanket?

PG 275

2) Suggest why solar cells rather than batteries are used in spacecraft?

3) What must be brought miserly a rotating coil of wire if an electric current is to be generated in the coil?

4) Ik Jin connects a coil of wire to a galvanometer . When he pushes the south low of the magnet into the coil, the needle of the galvanometer deflects to the right. In which direction, left or right, will the needle change when Ik Jin does the following:
a) pulls the south pole of the magnet out of the coil.
b) pushes the north wide of the magnet into the coil.
c) holds the magnet steady inside the coil.
d) holds the magnet habitual and moves the coil towards the south pole of the magnet?

6) What are the similarities between nuclear power stations and coal-hot power stations? What are the differences?

7) Suggest why there are no nuclear power stations in Australia.


Please when answering the questions writing the question you are answering as their are multiple numbers the same.

Thankyou and I hope you can help me

=)

2009-05-15 02:22:26 by Aleisha