Monday, June 21, 2010
All these lamps together with those inside the stadium present a power thirsty load to the power supply source. Today’s stadiums are supplied by up to 5 transformers and dedicated substations just to reduce power outages.
Wednesday, June 2, 2010
This question has been asked by many people who have experienced an
electric shock before.I recently received an electric shock from the
domestic household current of 10A.The feeling was ecstatic. Many will come
across large AC currents, but have you ever thought of DC Electrification?
This would sound weird because DC current available in domestic premises
is in the order of mA (milliamperes). In industrial environments DC current
is available in large quantities and is very lethal when handled improperly.
The severity of a shock largely depends on:---Amount of current
---Amount of time on the exposure
---Resistance of the body.
AC:Alternating Current AC in theory would allow your muscles time to be able to move so that you could pull your hand / limb
away from whatever it was that was giving you the shock. This is so because AC alternates from zero
to maximum (amplitude) in a specified time frame (frequency).It is during this timeframe that muscle
signals may retract you hand/limb...
The time frame we are talking about here is only a few milliseconds-which means that for larger
currents, there is no time for reflex action. However as I said above,
this largely depends on the amount of current flowing.
Starting current of motors (128A) would never give you a chance of even thinking! AC current will allow you to move your hand for the muscles which are not in the path of the electric
current.In AC (Alternate Current) the muscles will contract and extend and through the spasms you
might eventually free yourself (that is why people say that the current threw them while, in fact,
it was their own muscles).