Why DC current doesnt give electric shock while AC gives shock?
DC is usually 12 or 24 volts and not enough to create a burn on human skin. A high enough DC voltage will hurt. AC shock hurts more because it is really a series of shocks. An inverter raises the voltage from 12 VDC, which does not hurt, to over 100 VAC and 50 or 60 shocks per second. Really no fun at all. Note, if you think 50 or 60 Hz shock hurts, aircraft AC is 400 Hz and even a small shock leaves a person disoriented and nauseas. Some people say AC is measured in Hz (hertz) because, it HURTS!
Why electrical apllainces like TV FRIDGE work on AC current not DC current?
The main reason is that the generation and distribution of AC is much easier / cheaper. Electricity is distributed over long distances at a high voltage (to reduce losses in the transmission lines), and reduced to the normal household voltage using a transformer which will only work on AC.
When & Why is DC preffered over AC?
Traditionally, AC had two useful benefits over DC. AC allowed for an electric distribution system with lower losses over distance and AC enables a few types of electric motors which have significant benefits over DC motors for a lot of common tasks.Both advantages still exist today, but our ability to efficiently and inexpensively convert between AC and DC has started to change the game. Also, the need for DC is on the rise with the proliferation of computers and electronic devices.In very general terms, AC is more desirable when you need to drive a motor with it or easily change voltages. DC is more desirable when you need clean, stable power. Generators inherently create AC, batteries inherently create DC.In the modern world, we have to have both forms but we need to be intelligent about when and how we use each one.
Is AC current stronger than DC?
Not stronger, it's more dangerous. In terms of electrical power they are the same. The same formula P=I*U is applied both for DC and AC. All the trick with AC is that it can cause the heart muscle fibrillation. If applied to the heart directly even 0.01 mA AC current can be lethal. But it's true for AC currents with frequencies 20-1000 Hz. More higher frequencies are not so dangerous mainly because they don't penetrate human body so much. I don't know anything about muscle stimulators and what are their working frequencies but I think that they are used far away from the heart area so that the current path can't reach your heart.
Why is the use of AC voltage preferred over DC voltage?
Advantage of AC over DCWe all know that we got ac supply in our homes and we got this supply by transmitting ac over long distances. AC can be transmitted using step up transformers but direct current or dc can not be transmitted by this method.The ac is easy to generate than dc.It is cheaper to generate ac than dc.The ac generators have higher efficiency than dc.The loss of energy during transmission is negligible for ac.The ac can be easily converted into dc.The variation of ac can easily be done using transformers either step up or step down.The value or magnitude of ac can be decreased easily without loss of excess of energy. This can be done by using choke coil.
Which supply is used in domestic appliances ..ac or dc?
All the devises which are plugged in to the household electrical outlet takes AC. But some devises requires DC for their operation. Like most electronic devises runs on DC supply. So how do the DC requirement meet? This is done by the conversion of AC into DC by the rectifier. Additionally filters are also used to smoothen the DC obtained and reduces the ripples. Example TV, charger uses DC supply. Generally the devises which consists of motors runs on AC supply.Also AC is easily available and easy to transport whereas the same transportation of DC incurr more losses. AC using devises are motors, bulb, refrigerator, grinder, induction, geyser, etc
Dc current is required for home appliances to work but ac is supplied to our houses,how is this happen?
All home appliances work on AC and there is, usually, no requirement for DC.