Attention Electrical/electronics Engineers Want To Supply Cell Battery Powered Device With Dry

Why is earthing necessary in electrical systems?

To understand the “need” of earthing, we will try understanding what “earthing” or “grounding” mean and its benefits…Earthing or grounding simply means making an electrical connection to the ground (yes literally to the earth), but the way the connection is done has a process and a standard (more info on factors affecting earthing). Why do we do so? simple answer would be for “PROTECTION” of the human life or the electrical/electronic equipment…An earthing is a MUST for an equipment which has NO insulation and susceptible to a human contact - something like the water heaters, iron boxes etc…In case of an insulated equipment we still find the earthing to ensure safety for humans (Top priority) if the insulation fails… Coming to the second need, it is to protect the equipment itself- specially the electronic equipment - which are sensitive to external noise (Electromagnetic noises), static charges (Static electricity is a beautiful concept - refer to this link to understand the main cause behind a petrol bunk explosion)…By earthing an equipment how are we avoiding the peril to human life or a malfunctioning of an equipment? reason is simple: Earth offers a ZERO RESISTANCE path for any leakage current or a noise current - hence any current that would be a risk to human life or to the functionality of the equipment will be bypassed to destination which offers a least resistance path…The essence of a FARADAY CAGE application (LINK1 LINK2)…Earth has an enormous capacity to take in the free electrons as well as it serves as a source - The Earth’s Surface Serves as a Giant Source of Antioxidants in the Form of Free Electrons | Wake Up World

What is the difference between a battery and a cell?

The difference between a cell and a battery is that a cell is a single unit that converts chemical energy into electrical energy, and a battery is a collection of cells. According to About.com expert Mary Bellis, each cell contains two electrodes and an electrolyte, a substance that reacts chemically with each electrode, generating an electrical current. Aggregating cells into a battery increases the electrical voltage they produce.Batteries are classified by electrolyte type. "Dry cell" batteries contain electrolytes dispersed in a dry or porous substance packed between the two electrodes. In a "wet cell" battery, the electrolyte is a free-flowing liquid. According to the United States Environmental Protection Agency, wet cell batteries contain caustic chemicals that burn skin and release dangerous fumes. They also contain lead, which is toxic to people and animals and contaminates groundwater.Small batteries, such as those that power portable electronics, are usually disposable. These batteries have a single charge and require replacement after depletion. When rechargeable batteries are drained, however, they require connection to an external power source. After charging, the batteries are ready for reuse. Rechargeable batteries are commonly found in automobiles, laptop computers and mobile phones.According to the Mother Nature Network, disposable alkaline batteries are not environmentally hazardous and most municipalities encourage residents to discard them in household trash. Other batteries, particularly of the wet cell type, contain heavy metals and dangerous substances capable of causing serious harm to the environment, people and animals. These batteries do not belong in regular municipal garbage facilities and must be recycled or discarded according to local laws.For more info visit :https://www.electrikals.com/prod...

What happens when I connect the two terminals of a battery through a wire?

A wire is essentially an extremely low-Ohm resistor. The battery itself has some internal resistance that will limit the current flow (it can’t be infinite, after all). So the maximum available current from the battery will flow through the wire and back to the battery. Power is I^2*R, so even if R is very small, the current will still be significant and so will be the power - and all that power does is make heat.The wire will get hot.The battery will get hot.Depending on the chemistry of the battery, it may catch on fire and/or explode. The wire may melt.My brother, an auto mechanic once accidentally grounded the positive terminal of a starter motor to the frame of a car he was working on. A 12-Volt car battery has VERY low internal resistance, and the wrench he grounded through turned cherry-red in less than a second. He managed to break the circuit before anything caught on fire, but that wrench was ruined. The palm of his hand where he’d been gripping the wrench didn’t look all that great for a few weeks, either.

How many watts solar do I need to charge a 12 V 200 Ah battery?

How many watts solar do I need to charge a 12 V 200 Ah battery?Well, in how much time do you wish to charge it?I’ll state the formula here so that you can work it out with any capacity batteryAssumptionsBattery would be fully discharged or only 10% capacity would be remaining in battery. Battery voltages represent the State of Charge or SOC. For proper understanding please see the following image (Courtesy of Aussie Batteries & Solar|Australian Direct 12 Volt Shop for Camping, Caravan and Batteries Direct )2. You have at least 6 hours of peak sunlight available.MAIN WORKINGFirst we want to see how much power do we require to charge the battery. 12V200Ah can also be written as 12V*200Ah = 2400WHr or 2.4KWHr. Since we assumed that battery is at 10% level it means that we have to charge 2400WHr * 90% = 2160WHrThe energy we need from Solar Panels is 2.16KWHr.Now we have also assumed that there are 6 peak sunlight hours. So in order to charge these batteries in 6 hours we should have 2160WHr/6Hr = 360W Solar Panels.But there must be some losses right ?There are irradiance, temperature, conversion and (but not limited to) battery losses.I usually keep these losses at 20-30%.We would want to compensate these losses so that after all losses we still get the required power to charge 12V200Ah (10% capacity remaining) in 6 hours.So the end formula becomes[math]Solar Panels Total Power = ((Battery Voltage)*(Battery Ah)*(1-State of Charge)/(Charge Duration in hours))*(1+Losses)[/math]In our case it becomes[math]Solar Panels Total Power = ((12V)*(200Ah)*(1-10%)/(6H))*(1+25%)[/math][math]Solar Panels Total Power = 450W [/math]Now the complete sentence450W Solar Modules would charge a 12V200Ah (Fully Drained) Battery in 6 sunlight hours

Does proximity to magnets damage or affect batteries?

I assume you are talking about portable cylindrical batteries like AA, 18650.Magnets do not seem to affect these batteries in any significant manner except in the event of a freak accident.The distance between the positive and negative is just a very small gap. In a freak accident a magnet could snap on the top end of a magnet and connect the positive and negative, that would cause a short circuit, the battery would heat up and could cause a fire.Usually there is some form of protection at the top end of the magnet to prevent this, but not all batteries have it, and for old batteries the protection might have been removed.In this kind of accident, any coin, paper clip or small conductive object will have the same effect as a magnet, but a magnet is more hazardous, because it snaps on and stay on, for a non-magnetic conductive object, any accidental connection could be for a very short time and the connection is on and off.

What are the differences between AA and AAA batteries? Why are AAA batteries a little more expensive than AA batteries even though they give the same output voltage and current ratio?

Hi, thanks for A2A.    The difference between AA and AAA battery:1. AAA battery is smaller in size than AA battery. Energy storing capacity is proportional to the size of the battery. So even both batteries could give same voltage, AA battery will give it that output for a long time. 2. Amount of current carrying through the battery vary in AA and AAA. Its like water flowing through the pipe. If you need more water to use, you will choose pipe with large dia. If you need it small water supply you will choose pipe with small dia. Like that, for tiny and small current required products, AAA battery is enough. AA battery will be chosen where they need little more supply than AAA can provide. 3.  Otherwise, both batteries supply the same voltage. Cost difference is due to the factor of supply and demand of AA and AAA batteries. Hope it helps!