Yes. Most Power supplies don't care what frequency they run off, so 50 or 60 is not an issue. If your power supply has a voltage select switch on it, then you are all set: When you plug in to 220v, slide the switch across to 220/240V.
If not, then you will have to swap the power supply for one that does. If your system uses a standard ATX PSU, then it is simple and cheap. If it uses a custom smaller one, then they are more expensive.
The power supply will have a compliance label on it that will specify what it can use. Check that for full details.
Many notebook power supplies can use anything that is vaguely electricity-like. Rub them on your woolly jumper fast enough and they'll probably work. Again, check the label.
Check the back; if the power supply has a switch that lets you select the voltage the PC can be used either in the US or Europe. If it DOESN'T have the switch, read the manufacturers literature to see what's required. you may need to replace the power supply, depending on what you have.
No, judges have no power to change the UK law, only to interpret it in the situation of a court case. Only Parliament can change the UK law.
Some do and some don't. You need to check the power supply's specifications. The input voltage and frequency range is normally stated on a label visible from the rear of the computer. Many modern PC power supplies will accept a range of input voltage and frequency, or at least have a switch to chose between 110V/60Hz and 240V/50Hz.
PC Magazine - UK - ended in 2002.
PC Magazine - UK - was created in 1992.
That is not fixed but you can estimate the usage as 1 kW per person, so that a power station of 500 Megawatts could supply a population of 500,000 people.
According to the Wikipedia article on mains electricity by country, the power in the UK operates at 50Hz. There is a link below to the article.
UK power supply is 230V at 50Hz. It is compatible with the rest of Europe but a continental to British connector adaptor will be required. For visitors from North America, note that the voltage is higher than US and Canadian standards. Some power supplies and equipment will operate on 90V to 260V so they will work with just a connector adaptor. That is the case for most laptop supplies. Other equipment may be fixed at 110V, in which case, they cannot be used safely in the UK without an additional power converter (a 230V to 110V transformer for example). Every power supply has the input voltage marked on it. Be sure to check each power supply before connecting it to a UK supply. Suitable connector adaptors are available in many hardware and electronics stores in England as well as in airport stores. Although the airports are the most expensive place to buy them, it saves a lot of time searching for stores that sell them. Note that the connector adaptors DO NOT change the voltage.
I've purchased American PC games and played them on my computer in the UK and they worked well.
If "100 to 240 V" is stated on the rating plate of a small electrical appliance, such as an electric razor or a plug-in power supply for something else, that means it is designed to operate on any voltage between 100 Volts and 240 volts. * So the appliance will work if it is plugged into a 120 Volt household AC power supply in the US, Canada or elsewhere in the world which uses a similar supply and * it will also work on a 230 Volt household AC power supply in the UK or any other country in Europe or elsewhere in the world which uses a similar supply.
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Not without a suitable mains adapter to charge the battery. The UK mains voltage is 230 Volts - the US mains runs at just 110 colts.