Touching bare, live, contacts, connected to mains electricity will give you a nasty shock which could be fatal. Your house circuits have protection using circuit breakers, fuses and RCDs.
Large batteries have the capacity to deliver very large currents if shorted out, which can cause fires and may explode, showering acid and/or chemicals all over the place.
Power wise then its the mains voltage chemical wise it batteries - Batteries can still cause fires
Because they produce high volt.
only if you have batteries or really large capacitors available.
Large storage batteries made from lead and acid or by introducing it into the grid for payback from fossil fuels later.
The charges that build up on either surface can become quite large. When discharged the current will also be quite large. Large currents can cause severe injury. As an example, lightning is static electricity in action.
because they have lots of stuff that use electricity . like , ladders that go in different directions , water pumps and sirens .
Well, it depends on what you mean by "large." A capacitor can store a fair amount of electricity, especially those used inside CRT monitors. Beyond that, batteries such as sealed lead-acid batteries used in cars, motorcycles, boats, and UPS units all can store a good amount of electricity. Is this what you sought to learn or did you have something else in mind? Feel free to drop me a line if you wish further assistance.
Solar power is no more dangerous than any other large power station would be. Care should be taken for storage batteries as they could be a source of problems in terms of explosions, leakage and fire hazards.
Portable devices that do not consume large amounts of power can be run on batteries. Some battery powered devices can also be powered by mains - running a 'battery eliminator' - to save from having to purchase batteries. Devices that consume large amounts of power are usually best powered by mains.
I've always had good luck at Batteries Plus stores.
why the irresponsible discarding of batteries adversely affects humans and environment at large
The technology and processes required to make large lead-acid batteries are too complex, and dangerous, for 'home' construction. The acid is very dangerous, incorrect handling can lead to fire, explosion and serious injury. The 'How Do They Make It' TV series has a program on making lead-acid batteries in one of the worlds largest factories - watch that and believe you can not do it at home. You should buy your battery from a dealer.
Batteries have a large advantage over other power sources by being ready to deliver on short notice – think of the quick action of the camera flash! There is no warm-up, as is the case with the internal combustion engine (ICE); battery power flows within a fraction of a second.