Re: Electricity questions


"Albert" <albert.xtheunknown0@xxxxxxxxx> wrote in message
news:19c26383-805a-40d2-864f-56a12ac843b7@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi, these are a list of questions I can neither answer using formulas
I've learnt nor from results from experiments I've performed
(directly):

Why wouldn't you get a shock if you were hanging from a live wire
without your feet touching the ground?

Key word: "circuit"


Is it because 'you haven't made a complete circuit for the current to
flow through you?'

You betcha!
However, you'll get a shock (from a very high voltage) as your body
charges to the same potential as the wire, or the reverse can happen.
Walking along the corridor of a Holiday Inn with a nylon carpet
I was getting a shock when I touched the door handle to my room.
I was charging myself with static electricity from the carpet. The trick
was to touch the door with the key.

--
An electric blanket has two heat settings, one HIGH and the other LOW.
Which setting do you think has the greatest resistance? Give reasons
for your answer.

Watts = Volts * Amps.
Amps = Volts / Resistance.

Since Volts is a constant,
Watts is proportional to Amps/Resistance.

Lower resistance, more watts.
more watts, more heat.

--
Suggest a reason why the transformer that you used sometimes made a
buzzing noise.
My transformer had two coils clipped together with an iron core
linking them.

Alternating magnetic field mechanically vibrating the plates/windings.
Small transformers are usually dipped in a resin or plastic to prevent
movement as well as ingress of moisture which can cause corrosion.
Same with electric motor windings.

Do you know that just one turn short-circuited in the winding is fatal
to the transformer or motor?
The shorted turn acts as a secondary winding, a large current flows
in it, it heats up and cooks the insulation on its neighbouring turns
which also short out and you get that noticeable pong of burned
insulation/varnish. Switch off before there is a fire. There is no
recovery, rewind or replace the transformer/motor.
http://www.androcles01.pwp.blueyonder.co.uk/AC/m.gif



.

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