You get power, which is voltage * current (so both!).
Mains supply provides alternative current while battery provides direct current.
AC stands for Alternating Current and DC stands for Direct Current.
In the UK the mains voltage is 240 volts
The mains voltage is 230 volts, and the frequency is 50Hz.
What is a sinusoidal wave? This is a wave that appears to have curves. AC current/voltage. If you see a wave on a ossiloscope of what our AC (Alternating current) mains voltage that will be the answer to the question. DC (direct current) does not appear to have the same qualitys
No. Not unless you use a transformer to change the voltage. In the US mains voltage is 110-120 V and the current 60Hz Alternating Current. In the UK and almost all of Europe mains voltage is 230-240 V and the current 50Hz Alternating Current. So, if you attempt to use a US appliance in the UK the voltage, which is at least twice the amount of that in the US will create double the current in the device. This will either immediately blow an internal fuse, or burn the appliance out. In extreme cases it could even cause a fire.
220V
A 'service mains' is not associated with an electricity 'transmission' system, but with a low-voltage 'distribution' system. The service mains is the name given to the cable that connects a building to the low-voltage mains supply.
The main function of an electric circuit is to provide a path for electrons to flow. The electrons are from a current source flow or voltage.
230 V
Less likelihood of electrocotion.
For V, try it against a battery, or the mains ac voltage. For I, try (in series) it to measure the current through a known resistor with a known applied voltage. NEVER measure A against mains voltage!!! For Ohms, you should be able to try it against several known resistors. But make sure the internal batteries are OK beforehand.