Batteries

mA stands for milliampere and it is a unit of measurement used to quantify the amount of electrical current flowing in a circuit. In the context of chargers, mA typically refers to the charging speed or current output of the charger, with higher mA values indicating a faster charging rate.

There is no direct answer for this question, as voltage and wattage measure different quantities. It's kind of like asking "how many gallons are in a foot?" Volts are a unit used to measure the electric potential between points, while watts are a measure of power consumed by a circuit.

They are related, though, as expressed by the power equation: P = V x I

where: * P is power in watts * V is the voltage across a circuit, in volts * I is the current flowing through the circuit, in amperes (amps) Thus, if a circuit has 1 volt across it, and one ampere flows through the circuit, then 1 watt of power is being used. The amount of current depends on how resistant the circuit is to the flow of electricity, and the voltage applied, according to Ohms Law: I = E / R

where R is the resistance of a circuit in Ohms A useful analogy is to compare a circuit to a plumbing system. Let's say we apply water pressure to one end of a pipe, with a closed valve in the middle. The difference in pressure accross the valve is equivalent to voltage accross a circuit. However, with the valve closed, no water is flowing - just as no current would flow through a switch if it is turned off, and thus no wattage would be used. Opening the valve would cause water to flow through a pipe, just as turning the switch on (closing the circuit) would allow current to flow through the circuit. The current flowing through the circuit (or speed of water through the pipe) would depend on the resistance of the circuit (or the diameter of the pipe) and the voltage accross the circuit (the water pressure). The wattage used by the circuit would then be roughly equivalent to the amount of water passing through the pipe per second.

Any strength of power source can be used to make an electromagnet. A single AA battery, used well, can (at least briefly) power an electromagnet that can hold several pounds of metal in the air. An electromagnet's strength is determined by three factors: * the material in the core (air makes a weak magnet; iron a reasonably strong one) * the amount of current in the wire * the number of turns that the wire makes around the core The strength of an electromagnet is often referred to in "amp-turns": the number of turns times the amount of current it has. A simple battery approximates a voltage source: that AA battery pushes out about 1.5V of electricity. Divide that 1.5V by the resistance of the wire (longer wire higher resistance) and you get the current in the wire. At least, until your voltage source gives up and can't deliver that much current any more--then you need a new battery. :)

No, the Black and Decker 18-volt cordless hedge trimmer NHT518 is not designed to operate on a 24-volt battery. Using a higher voltage battery than what the tool is designed for can damage the trimmer and may pose safety hazards. Stick to the recommended voltage for optimal performance and safety.

For the power to flow from your batteries to the device they are supposed to power there needs to be good connections at the battery terminals. With disposable batteries you were guaranteed new terminals each and every time you changed batteries so there was little need to clean the terminals, but with more and more people nowadays powering their GPS receivers and other devices with re-chargeable batteries it's becoming more important to clean the terminals on the batteries regularly. There are a number of ways you can do this. You can use one of the myriad terminal cleaners that you can find in camera or electrical shops. The gadget to look for is the one that looks like a pen but actually has a fiberglass tip, this I find is the best battery cleaner around. Failing that, you can take some fine sandpaper to the terminals - it works just as well (if not a bit too well - don't go overboard on cleaning!). As a rule I give the terminals a clean before re-charging the battery - this way the battery gets a good charge (muck on the terminals affects charging too) and they are then ready for immediate use. Technorati Tags: GPS, Satellite Navigation, Global Positioning System, Battery, Rechargeable, NiMH Posted by Kathie on November 10, 2005 3:47 PM.
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purchase this unit and took it to orlando,florida the next day.....very easy to learn to use. very reliable. spent 10 days with this gps and never missed a show, dinner or intersection to turn.....unit will quickly re-route you if you miss a turn.....very much appove and enjoy this gps unit. Yep.. see my site www.butkus.org/initial/ Yes, I have one. So far it works well. The user guide is nearly useless but the system functions fine. The display is easily visible day or night. The MP3 Player also plays wma files. Navigation is easy and works as well as any other computer navigation system.
If you want a GPS unit that simple takes you to your destination, here ya go. It doesn't take pictures or play videos or give you moon phases - it just tells you how to get someplace. The larger screen is nice but the fonts used for street names can be a little hard to read. The Initial uses the same NAVTEQ data as the name brands so the directional performance should be the same. But as has been said, getting an update is unlikely.. Good basic large screen unit for the money.

You can make a magnet three ways:No1. Get a metal rod and wrap some Insulated copper wire around it. You can use some other wires but it might not work as well. Make sure the wire isn't too thick. Wrap the wire 50+ times. Connect the two ends of the wire to a battery. Don't connect it to a strong power source as it will get very hot. I connected mine to a 1.5 volt battery and it could lift up my scissors then drop them again.(Note: The iron rod now has become a weak permanent magnet. The more current you add to it the more stronger it will be and the longer you have the battery on the stronger it will be.. Also, don't drop it as it will lose it's magnetic properties.)No2. Get a magnet. The stronger the better. Rub one end only of the magnet up a piece of metal then when you get to the end take the magnet off the metal and take it back to the start making sure the magnet doesn't touch the metal. I don't really like this method as it takes a long time to get the metal to pick up anything decent.No3. Get a magnet and let it stick to a piece of metal. The piece of metal will be weak but enough to make the needle on a compass move.

Hard-wired "home" type smoke detectors can not be adjusted for sensitivity. Detectors that appear "too" sensitive are usually very dirty or located in the wrong place. Carefully review the lengthy instructions that come with each detector with regard to selecting a location. Avoid: high air velocity areas such as near air conditioner vents, areas outside bathroom doors where steam vapors waft out, kitchen areas where the cooking smoke can get to the detector before disapaiting Studio apartments pose an obvious problem. You can try cleaning the detector to make it less sensitive by following the manufacturer's cleaning instructions, but when in doubt, replace it. Isn't your life worth $10.00?

outside temp has nothing to do with engine temp, you just have to leave it running for a little bit. i would suggest at least 5 min. Bad thermostat. Probabl;y stuck wide open. or it is heating up, but your coolant temp sensor is bad and it is saying it is cold

Exit signs in public, commercial and industrial locations must have a back-up means of remaining illuminated should the power fail. Most signs meet this requirement with a back-up power supply, such as a battery.

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There are special exit signs that use phosphorescence (photoluminescent) material (glow in the dark) that remains illuminated for a short time after a power failure.

Also, some occupancies are not required to have "emergency lighting", perhaps because they are small enough to safely evacuate without lights, and exit signs in such an occupancy are not required to have any backup power at all.

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So, technically, no, not all exit signs are required to have a battery backup. You might want to consult NFPA 101 "Life safety Code" at the library for all the details on exit sign lighting, as well as exit illumination. NFPA 101: 7.10.4, for example, any required emergency lighting must to last for at least 90 minutes, and it must illuminate the exit signs that are not photoluminescent, but not every occupancy requires emergency lighting, let alone backup, or lighted exit signs.

A survey battery test is a collection of related survey questions or assessments that are designed to measure various aspects of an individual's skills, abilities, attitudes, or characteristics. These tests are often used in research, education, or psychology to gather data and insights on specific topics.

When placing voltage sources in parallel, the total voltage is the same as the individual battery's voltages. For example: If I was to place 4 "AA" 1.5 volt batteries in parallel with a life of x hours, the out put would be 1.5 volts with a life of 4x hours.

note: never place batteries in parallel that are not in the same condition (charge, voltage, ect...).

Galvanic cell, voltaic cell, electrochemical cell. Do not confuse it with electrolytic cell.

The voltage of 6 AA batteries connected in series is 9 volts. Each AA battery typically provides 1.5 volts, so when connected in series, their voltages add up.

The Utilitech AA batteries are manufactured by a company called Sunbeam Products, Inc. under the Utilitech brand.

A standard AA battery contains approximately 25 milligrams of silver in the form of silver oxide. Silver oxide is a component of the battery's positive electrode, which helps to conduct electricity during its operation.

A quantum leap is the smallest possible change that an electron can make in an atom. It involves a discrete jump in energy levels when an electron transitions from one orbit to another. The size of a quantum leap is determined by the difference in energy levels between the initial and final states of the electron.

The most important part of a textbook is typically the content, including the information, examples, and exercises provided to help students learn and understand the subject matter. Additionally, a clear organization and structure of the material can also significantly impact its effectiveness as a learning resource.

this happens mainly because a charged body loses its charge through leakage into the atmosphere. this is particularly so if the air is moist.besides this the terminal also get oxidised with time.that battery has a finite life is also due to occurence of the unwanted chemicals and physical changes to or the loss of the active materials of which they are made. this might happen if the membranes that separate different chemicals erode or lose their character.

You shouldn't. Batteries are terrible for the environment. Look for battery recycling facilities in your area to prevent poisoning our water.

Lithium batteries are primary cells. That is, they're used up and thrown away. They're not rechargeable. Lithium-ion batteries are rechargeable. Which is better depends on your need or application. For example, if you had to buy and replace cell phone batteries all the time it would be expensive and a pain.

These gag pens mostly use "AAA" size cells. They are, after all, "pens" as in the writing instrument. The triple A cell will fit inside the body of the pen and it won't look too "fat" to alert a potential "victim" to the prank. Original answer by Quirkyquantummechanic

Some shock pens use mercury batteries for size because they need to fit it in.

You can - but it will take a little longer to charge the higher capacity battery.

It really boils down to the amount of power that the battery can 'store'. Smaller batteries are convenient but actually store less power than the larger, bulkier batteries do.

Since POWER = VOLTAGE x AMPERAGE and the overall power is less in the higher voltage battery, then, it must mean that the amperage, or current available in the 9 v battery is less in the long run than the 6 v battery.

For instance, an automobile battery is 12 v and has to pack quite a wallop to get a car started, yet there are much smaller 12 v batteries but they'd never be able to generate enough amperage to start the car.