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FAQ

I want to run an appliance that uses DC 5V 2.5A at 6 watts consumption using an adapter from the cigarette lighter socket. I have a standard 12v car battery in the small car. Do i need to get a bigger battery/more batteries, special alternator, or something else to run this appliance permanently?Is there an online calculator to help me work out how much battery power i need?Many Thanks to all answerers.

First, 5 V times 2.5A equals 12.5 W, not 6 W. I'll assume, therefore that 6 W is the average, but the peak may be 12.5W. Also, assuming no conversion losses by the adapter, 12.5W in 12.5W out. Since the socket delivers 12 V, you're looking at about 1A peak. To a second approximation, divide by the adapter's efficiency (I'd guess 85%) to find out what's drawn - might be just shy of 15W. Most sockets have a current or power rating. My car says 120W, 12V - which translates to 10A. If you can't find the rating, check the fuse rating. It's probably 10 or 15A. If your car socket has the same rating as mine, you could run 8-10 of your appliances with no problem, all at peak, and 20 of them on average.

Can I use 240 volt electrical equipments into 220 volt? Should I need a transformer?

no, 220/240 is within tolerances

definition

that girl really waffles on.an rcd monitors current flow between active and neutral.If an imbalance is detected between active and neutral it will mean that this imbalance is travelling to earth.The rcd's sensing equipment detects this leakage current and operates the release mechanism in turn switching off the power supply provided the leakage is equal or greater than the rcd rating ie 30mA

I see a a lot of ghost hunting shows where they use something called k2 or kII meters. What are these originally used for?

K2 is a brand name for a type of electromagnetic field detector used for measuring fields induced by power lines and electrical equipment.

i.e. extended warranty.

I know this isn't much of an answer but I think it depends on the item. For example, I bought a $32 toy and toys-r-us tried to sell me a warranty that was $12. Doesn't really make sense. But the warranty on my flat screen TV is probably a good value. -- On a side note, it is wonderful that items are so cheap now that we have to consider the value of the warranty but I am worried about out throw-away society. I had a neighbor that just bought a new lawn mower because it leaked oil. That would cost $12 to fix. Oy!

I have a piece of electrical equipment that uses a 12v DC in that i want to replace with a battery, as it currently uses a wall charger with an AC converter. How would i go about doing this for cheap? making it myself wouldn't be out of the question, all i need is a guide. The 12v pack must also be as small as possible, as it is powering a portable device.

You want to replace a battery charger with a battery? Makes no sense. 12V is quite a voltage - you need 8 1.5V batteries, or a 9V and 2 1.5V batteries, but that only take scares of voltage. You also need POWER (amps). Say you power 20 W of speakers, that requires about 1.6 A - not a trivial current for common batteries. Think car battery (which is not very portable )

I just arrived at my cousin's house. He makes his own lamps and things. He uses batteries and circuits and lightbulbs, basically, living in a battery-lit home. Being ridiculously green, he claims its more energy efficient than using the city grid. We got in an argument about global warming, and in short he claimed he was helping by using battery power rather than electrical power. I said that wasn't accurate because batteries, lightbulbs, etc use more power than the grid does because they have to be made using electrical equipment in an electric factory. Am I right? What uses more power?

This debate depends on a few things such as how are the batteries charged, the cost of building the ciruits that operate the devices, the cost of electricity and other factors which I cannot think of right now. Also, are the batteries rechargeable? I would assume so in this case. I suspect that it would take a indeterminate period of time (at this point) for there to be a payoff for a battery run home to be less expensive that a conventionally powered home. Part of a conventionally powered home possibly being cheaper in the beginning would be the mass production of devices. When your cousin says things are powered by batteries, is it a battery bank supplying a converter of DC to AC or are his devices running soley on DC supplies? The best way to resolve the answer is to calculate all the electrical costs that go into powering his home and then also calculate how much it would be to run a similar home on the grid. There might also be a few costs that are left out due to their choices of what to leave out of their home or how they accomplish or forego the luxury of in their home. At this point, there are probably not enough studies available to get a general consenus of which is cheaper. There is also another point to consider which is how often do they have to replace their batteries?

I have two orange electrical outlets in my dorm and I want to plug things like my lamp, fan, phone charger, etc. into them. Is that safe?

Orange receptacles are Isolated ground, meaning the ground hole on the receptacle doesn't mechanically connect to the mounting yoke, typically used for computer circuits. A ground wire has to be directly attached to the ground screw even with metal conduit systems. They normally also have a green triangle. amzn.to/1Nsbgyv They are designed to isolate the ground from equipment that could create electrical noise on the ground, you shouldn't use it for things with motors. I have also seen some receptacles that where an odd color of red, that almost looked orange. amzn.to/1Nsbohu Red is the designation for emergency power. Small items like you mentioned should not be a problem, would be good to use for clocks with critical alarms.