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Consumer Electronics
Ask questions here about the electronics you use every day: from phones and computers to kitchen appliances and radios.
4,952 Questions
How can you completely reset your casio pcr-t275 cash register?
This is a second hand machine. We are a non-profit thrift store where taxes are not applicable. How do we reset the tax program so non is charged to the customer/
How do you make a antenna for my mp3 players FM radio?
If the player enables radio it should use either an in built antenna of use the earphones as an antenna. Nothing more to buy or build.
What happens when your ipod touch says connect to itunes?
after a couple weeks/days the ipod finally shuts down and restores which means basically everything is restarted on that device
How do you switch the locked out channels on a regency scanner Z 10?
Simply press the SCAN button to put the scanner in scanning mode, then press the number button for the channel you want to lockout or unlock. For example, to lockout channel 5, just press the "5" button while scanning; to unlock channel 5, press "5" again. This works for many Regency scanner models.
Does potential energy increases or decreases when gas changes to liquid?
The potential energy of a substance decreases when it changes into a liquid. This is because it's losing the heat energy it had when in gas form to become liquid.
How do you hook up a 1 farad capacitor to your amp?
The key is lots of capacitance, as close to the amp as possible, and thick cables capable of carrying lots of current.
Answer 3Be very careful with that thing. The current output of a capacitor is the product of capacitance, in this case 1, and the change in voltage with time. Thus, if you do something to cause a quick change in voltage with that, you will get a very large current spike, possibly hundreds or even thousands of amps.Also note for this reason you should really pre charge capacitors of this size. Let's say you have 1 ought wire run from your battery to the cap, with a resistance of .001 ohms. (I actually have no idea what the resistance of your wire is, I just made that up for argument's sake) When you connect the discharged capacitor, you are causing an instantaneous change in voltage. (IE dv/dt equals infinity) This means that the capacitor will appear to the circuit as a dead short. Thus, the _only_ thing limiting your current flow is the wire. Ohm's law states V equals IR. As the wire is only 0.001 ohms and the system is 12V, this means that when you connect that cap to your car battery it will ["try to"-j3h] draw 12000 amps. I don't think that's good for any part of your system.
The solution? Get a resistor and charge the cap through it. The resistor will limit the current flowing into the capacitor until it is fully charged. Then it is safe to connect as the potential between the capacitor and the battery will be 0VDC. A light bulb will work very well for this task, if you don't have any power resistors laying around. This will lengthen the life of both your battery and your capacitor. Also note that if you have a fuse between the battery and the cap, the surge current will blow the fuse without pre charging. If you have a switch or relay in between the cap and the battery, a pre charge circuit must be used as the surge current will weld the contacts closed. (I've seen it)
Answer 4Hi -Don't mind me but fortunately a car battery really can't put out 12,000 amps due to the limiting source impedance of the battery- You might get only a thousand amps at best !!!!(using thevian and norton theory)-OK this is still dangerous. OK like a lot dangerous but the internal resistance of the source, the battery its self is also a part of the equation- Dead shorting a battery is bad news- also you might consider the time constant to charge the cap !!! Tc= R times C (five usually required for full charge)
Answer 5
In each "Time constant" (T) the potential on the capacitor will increase .67 of the remaining way to the battery potential. If the limiting resister is large, this could take minutes, if small then milliseconds. You want a few seconds.
Yeah LIKE anybody can go out and buy one. 1 farad is very big to charge that thing, it will take forever if and one volt supplied from a one ohms source and 1 ohm 1 x 1 x 5 = 5 seconds. Now it is almost fully charged. Some people just don't pay attention to what they read I guess. How to connect it to the input a very Good short for a very long time at the output the same results
Answer 6
First of all I'm going to say all you have to do is make sure that you use thick oxygen free car audio wire. I did a reinstall the other day and someone had used 220v household cable to wire their amp! Who does that? that being said single -aught is going to be efficient enough for all of you 1 farad guys it's easy just make sure pos to pos and neg to neg and for goodness sake charge the thing before you use it. If you read up on this page somebody has already taken the time to explain the ohms law and how to blow up your battery so be careful.
Answer if it is a capacitor made for a car amp the have a circuit board on top so they will not instantly charge off the battery they will charge slowly till they are full on their own that's how they were designed.
Re; Answer 6. What on earth is "oxygen-free audio wire"? I have assembled a good deal of industrial electrical and electronic equipment over the years, much of it to tight quality-control specifications, and NEVER has that description appeared anywhere. And this is equipment needing better quality than in a hi-fi. Those peddling it have found a nifty way to charge over the odds for... plain, or perhaps tinned, copper wire. Yes, some copper is treated to remove any included oxygen but that is for heavy sheet and profile sections purely for welding, to prevent brittle welds: its electrical properties are not affected. It matters in some parts of an audio circuit that the leads are screened against interference, and the wire should be bright or tinned in connections because surface oxide will degrade the connection and may even introduce odd partial-rectification problems, but the notion that it has to be some magical "oxygen-free audio wire" is a myth and a con.
Careful not to exceed the Caps voltage rating. 1 farad caps typically are a low voltage device.
Can magnetic card reader resert the pin code inside the card?
Pin numbers are not stored in the magnetic stripe on cards. This would make it too easy for thieves to use a code reader to get your pin. The pin is stored on the banks computer.
Can rechargeable batteries be charged by a car battery charger?
It's a good idea to avoid charging any battery with a charger that was not designed specifically for that kind of battery. A car (vehicle) charger is generally designed to recharge 12 volt lead acid batteries. (The actual voltage of the battery and charge is a bit higher than 12 volts.) Rechargable battery packs come in different voltages, and many if not most are not lead acid types. A lot are nickel-cadmium or lithium types, and they need a "controlled charge" that a vehicular battery charger will not be able to provide. And that's setting aside the issue of the voltages of the battery and the charger, which is critical.
It's a bad idea to attempt to recharge a battery with a charger that is not designed to recharge that "flavor" of energy storage device.
How do you hook up a DVR when you have a satellite TV box?
The following procedure may vary, depending on if you have Dish Network or DirecTv. Connect one or two tuners to the "satallite in" on your DVR. Two is necessary in order to record two shows at once. Then, if you are working with standard definition, connect a yellow composite cable as well as two RCA audio cables to the TV and DVR. If you are working with High Definition, connect a set of component cables (blue, green, red) as well as two RCA audio cables to the DVR and TV. Also, you can connect an HDMI cable to the TV and DVR, which allows for HD video and audio to your tv with one cable. For more info on these cables and what they do, go into your local electronics store. Hope this helps and good luck!
What do the i and o mean on electronics?
I means ON
O means OFF
OR
Input/Output The I/O refers to data transmission within a buss between peripheral devices. It has absolutely nothing to do with machine language. It is also one of the three main processes essential for computers.
Why transfer characteristics cannot be obtained for a bridge rectifier?
Its because one of the diode gets shorted.The diode in the left lower arm in a bridge rectifier gets shorted by the ground points of both the cro and the function generator.
What are two ways electric circuits can be arranged?
Electric circuits with 2 terminals can be arranged in "series" or in "parallel". This applies to all 2-terminal circuits - including fundamental components such as resistors, capacitors, or inductors.
The term "series" means that an electrical path in an existing circuit is broken and the circuit is connected to the 2 terminals of the break.
The term "parallel" means that the electric circuit is connected between 2 existing terminals or nodes of the existing circuit.
How to Connect CRO to computer?
The CRO can be interfaced to the Computer in many ways. 1. GPIB network:A NI-PCI-GPIB card is inseted in any PC slot of computer and it is interconnected to the CRO GPIB port.The CRO control and measurements can be performed using LabVIEW. 2.Now a days Computer inbuilt CRO's are available in the market form Tektronix ,Agilent etc. 3.You can interface CRO to the computer through LAN, using necessary drivers etc. Regards Ranga
What are start and run windings of a motor?
Start winding determines the direction of rotation.
Start windings are considered "secondary windings" and run windings "primary". Usually, the start windings disconnect from the power circuit and dry film capacitor(s) at about 75% of the motors full speed. There are some motors with oil filled capacitors that keep the secondary "start" windings in the power circuit but only disconnect the dry film caps. The primary "run" windings are always in the power circuit. There are more, could write a couple of pages on the whole workings.
What is the definition of electronics engineering?
electronics engineering is the branch of engineering which deals with the flow of current in a semiconductor devices/components.
Semiconductor devices/components are those element which made from semiconductors like silicon germanium GaAs and other material.
they are widely using in current generation.
Why cant you use visible light to see molecules?
because light used to see an object must have a wavelength
Who invented the gattling gun?
The Gatling gun (with one T) was invented by Richard Gatling, for whom it is named.
Can you use any usb mains charger to charge your flip mino hd camera?
If the mains charger is not broken it will work as good as a computer usb port, all they do is supply 5V to the battery charging circuitry inside your camera.
Its A Candelabra base bulb :-)
However, one can find "medium" sized base bulbs marked "Type B."
What does the current that flows in an electric circuit carry?
Click on the link below for more information.
