Yes, you can charge a Bluetooth keyboard from the UK mains using a compatible USB charger. Most Bluetooth keyboards charge via USB, so you would need a USB power adapter that fits into the UK mains socket. Ensure the charger’s output voltage and current meet the keyboard's charging requirements to avoid damage. Additionally, using a USB cable with the appropriate connector for the keyboard is essential.
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.
In the UK the mains voltage is 240 volts
UK mains electricity operates at a nominal voltage of 230 V (+10%/-6%), at 50 Hz.
The mains supply in Scotland is 50Hz.
230 V
no
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.
no
Using a Mac purchased in the US in the UK should not present any major problems. The Mac's voltage range is 100-240V AC which covers both the US 120v and UK 240v mains supply. You will need a UK plug/lead - depending on which Mac you acquire. The keyboard layout is different but you can plug in a UK USB keyboard if required. Depending how you bring it into the UK you may be liable for VAT/Import/Customs duty which will add to your initial purchase price.
Get a mains adapter at a travel store to connect your charger's two-blade Edison plug to the UK's BS 1363 standard. The charger itself is universal voltage, so it accepts 100-240V input.
Mains electricity is nothing but main source of power in an installation. From the mains the power is then branched out to different end usage.
No.