I will be hopefully visiting America later this year.
I have some electrical items.

The `infamous netbook`, the mains supply transformer states 100 to 240
volts.
The other an electric shaver with no details on it so could be 240v only.

Should the laptop be ok to be charging over there on 110v.
If shaver is 240 volts only would it run but slower.

Also for charging phones will they charge but at a slower rate.

ss wrote:

Should the laptop be ok to be charging over there on 110v.

yes

If shaver is 240 volts only would it run but slower.

I'd expect it to be more like a rough plucking, than a shave

Also for charging phones will they charge but at a slower rate.

Should just take more current from the mains (or take it for a larger
fraction of the mains cycle) and charge the same.

On 18/07/2019 22:27, Andy Burns wrote:
ss wrote:

Should the laptop be ok to be charging over there on 110v.

yes

If shaver is 240 volts only would it run but slower.

I'd expect it to be more like a rough plucking, than a shave

It will try to run at 60Hz rather than 50Hz and may not work at all.

Famous brand rubbish US made mains shavers sold in the UK mostly at Xmas
used to rely on a 60Hz mechanical resonance to work properly. Once most
people tried a proper European made shaver they never went back.

A decent proportion of hotel bathrooms have 240v ac available in them.

Also for charging phones will they charge but at a slower rate.

Should just take more current from the mains (or take it for a larger
fraction of the mains cycle) and charge the same.

Most PSUs for phones and laptops really don't care about the mains input
voltage provided that it is above 100v and below 260v. OTOH Some US made
kit is notorious for only working on US 110v mains at 60Hz (transformers
that will saturate on 50Hz supply) with shoddy transformers and
insulation that is barely up to the job.

--
Regards,
Martin Brown

"Martin Brown" wrote in message
...
A decent proportion of hotel bathrooms have 240v ac available in them.

Quite possibly, though maybe 220 V (two anti-phase 110 V supplies, as is
supplied to houses to run high-power devices like aircon, tumble driers,
cookers).

However I'd still expect it to be 60 Hz, not 50 Hz. Depending on how much
the transformers or coils in motors are tuned, they may or may not work at
60 if there are designed for 50.

On 19/07/2019 16:30, NY wrote:
"Martin Brown" wrote in message
...
A decent proportion of hotel bathrooms have 240v ac available in them.

Quite possibly, though maybe 220 V (two anti-phase 110 V supplies, as is
supplied to houses to run high-power devices like aircon, tumble driers,
cookers).

However I'd still expect it to be 60 Hz, not 50 Hz. Depending on how
much the transformers or coils in motors are tuned, they may or may not
work at 60 if there are designed for 50.


60hz works on 50hz transformers. The reverse is less lilkely to be true


--
All political activity makes complete sense once the proposition that
all government is basically a self-legalising protection racket, is
fully understood.

"The Natural Philosopher" wrote in message
...
On 19/07/2019 16:30, NY wrote:
"Martin Brown" wrote in message
...
A decent proportion of hotel bathrooms have 240v ac available in them.

Quite possibly, though maybe 220 V (two anti-phase 110 V supplies, as is
supplied to houses to run high-power devices like aircon, tumble driers,
cookers).

However I'd still expect it to be 60 Hz, not 50 Hz. Depending on how much
the transformers or coils in motors are tuned, they may or may not work
at 60 if there are designed for 50.


60hz works on 50hz transformers. The reverse is less lilkely to be true

Ah, OK. I thought it might be a reciprocal arrangement, but evidently it's
not.

I wonder how US came to standardise on 60 Hz and Europe on 50 Hz in the
first place.

Is it generally 50 Hz = 230 V (+/- tolerances) and 60 Hz = 110 V (+/-
tolerances) or are there some countries which have standardised on 230 V @
60 Hz or 110 V @ 50 Hz?


In my innocence, I thought that 240 V implied bayonet light bulb fittings
and 110 V implied Edison screw light bulb fittings... Until I first went
round IKEA and couldn't work out why a Swedish (and so 230 V/50 Hz) country
would stock only screw-fitting light bulbs. Then I learned that we in the UK
are in the minority, and many countries *both 110 V and 230 V* use the same
screw fittings.

Incidentally, if you are buying SES (female) to SBC (male) or to LBC (male),
look out for a design flaw that we encountered with some cheap converters
(probably of Chinese origin): the central spring contact which should touch
the tip of the ES bulb, also makes contact with the sleeve of the bulb as it
is pushed in when the bulb is screwed in. Result: a loud bang and the MCB
(and maybe RDC) trips. Happened to us with several converters of one make,
so they are going back to Amazon with a note "DANGEROUS PRODUCT: WITHDRAW
FROM SALE".

Even more incidentally, when you are installing Philips Hue bulbs, or other
similar ones which are capable of being turned off at the bulb even though
there is power to the socket, don't make the mistake that I did as I was
rewiring the GU10 adaptors up in the bedroom ceiling. Remember that even
though none of the bulbs are lit, there may still be power. I'd been so good
about turning off both the wall switch and the relevant MCB, apart from the
one time I forgot... 240V through a finger is not to be recommended, even
for the regulation 30 msec before the RCD trips.

On 18/07/2019 22:23, ss wrote:
I will be hopefully visiting America later this year.
I have some electrical items.

The `infamous netbook`, the mains supply transformer states 100 to 240
volts.
The other an electric shaver with no details on it so could be 240v only.

Should the laptop be ok to be charging over there on 110v.
If shaver is 240 volts only would it run but slower.

Also for charging phones will they charge but at a slower rate.


Things that you connect to the mains almost always show what voltage
they will accept and how much power they may draw, so it is best to look
at each device. In America the frequency is 60 mHz compared to 50 Hz in
Europe. If you want to know about your electric shaver google or the
manufacturer should know. The USB PSU I have to hand says it would work
with 110v, 60 Hz so would charge at the normal rate.

--
Michael Chare

On Fri, 19 Jul 2019 01:06:45 +0100, Michael Chare wrote:

On 18/07/2019 22:23, ss wrote:
I will be hopefully visiting America later this year.
I have some electrical items.

The `infamous netbook`, the mains supply transformer states 100 to 240
volts.
The other an electric shaver with no details on it so could be 240v
only.

Should the laptop be ok to be charging over there on 110v.
If shaver is 240 volts only would it run but slower.

Also for charging phones will they charge but at a slower rate.


Things that you connect to the mains almost always show what voltage
they will accept and how much power they may draw, so it is best to look
at each device. In America the frequency is 60 mHz compared to 50 Hz in
Europe.

Not sure it's quite that low! 0.06 Hz?

If you want to know about your electric shaver google or the
manufacturer should know. The USB PSU I have to hand says it would work
with 110v, 60 Hz so would charge at the normal rate.





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My posts are my copyright and if @diy_forums or Home Owners' Hub
wish to copy them they can pay me £1 a message.
Use the BIG mirror service in the UK: http://www.mirrorservice.org
*lightning surge protection* - a w_tom conductor

On 18/07/19 22:23, ss wrote:
I will be hopefully visiting America later this year.
I have some electrical items.

The `infamous netbook`, the mains supply transformer states 100 to 240
volts.
The other an electric shaver with no details on it so could be 240v only.

Should the laptop be ok to be charging over there on 110v.

It will be ok.

If shaver is 240 volts only would it run but slower.

Why not try it over here? Can't you find anyone with a bathroom power
supply for shavers? They always seem to have dual voltage outlets. I've
even seen them in public toilets in shopping malls and airports.

Also for charging phones will they charge but at a slower rate.

No. They will have a SMPS like your Netbook supply, and will work the
same way in the UK and USA.

--

Jeff

On Thursday, 18 July 2019 22:23:20 UTC+1, ss wrote:

I will be hopefully visiting America later this year.
I have some electrical items.

The `infamous netbook`, the mains supply transformer states 100 to 240
volts.
The other an electric shaver with no details on it so could be 240v only.

Should the laptop be ok to be charging over there on 110v.

of course

If shaver is 240 volts only would it run but slower.

no. If it's rechargeable with lightweight psu it'll work. If it's a direct mains only it won't.

Also for charging phones will they charge but at a slower rate.

assuming you're using a lightweight wallwart, won't be affected. Old heavy warts won't work at all.


NT

expressed precisely :
If shaver is 240 volts only would it run but slower.

no. If it's rechargeable with lightweight psu it'll work. If it's a direct
mains only it won't.

Some none battery / mains only types have a DC motor, running on a
built in SMPSU. I think I am correct in suggesting one of my old
Phillishaves could be run on both ac and dc, from 240v to dc as low as
12v. I always meant to try it on 12v, but never did.

On 19/07/2019 09:03, Harry Bloomfield wrote:
no. If it's rechargeable with lightweight psu it'll work. If it's a
direct mains only it won't.

OK thanks all, a couple of adaptors and I should be good to go.

ss pretended :
On 19/07/2019 09:03, Harry Bloomfield wrote:
no. If it's rechargeable with lightweight psu it'll work. If it's a direct
mains only it won't.

OK thanks all, a couple of adaptors and I should be good to go.

I didn't write that!