Step down transformer from 220 volts AC to 110volts AC
An adapter is needed to use a North American shaver in Europe. European outlets are a different size along with a different voltage that you shaver is rated for. An Adapter will take care of both of these problems.
No, the voltage from the adapter should match the voltage required by the appliance.
On both the primary side and the secondary side the answer is no. It's OK if the voltage is within 10% of your original AC Adapter.
use the one that came with your tv
Yes, the manufacturer specifies what the working voltage of a device will be and that voltage has to be adhered to.
Changing a fuse size does not change the voltage output. An adapter is a transformer. The transformer in this adapter has a set of turn ratios determined by the manufacturer to produce a specific secondary voltage when inputted with a specific voltage. You may be able to use the adapter on another device but it has to conform to the specifications of the adapter as it now stands. The fuse protects the primary side of the adapters transformer so as to not overload the transformer. If the fuse is up sized then the risk of overloading the adapter becomes a possibility. This could burn the windings of the transformers secondary and render the adapter useless.
No, the voltage is too high.
You should not use a power adapter with a higher voltage output than the input rating on the computer. It can cause damage to the computer and the battery. You can use a lower voltage. If you do and you are using your computer, it might not charge but it will prolong the time you have before it runs out. If you do not use it, then it will charge but slower than with the correctly rated power adapter.
The European Union is an organisation that consists of 27 countries, 17 of which use the Euro. There are many other countries in Europe that are not members of the European Union and none of these use the Euro. So most European countries do not use it. See the related questions below.
no, different voltage could fry solid state components.
Every country has a different voltage of power source. It's better to use always an adapter if you don't know the voltage of power source of such country to avoid frying your devices.
not unless you want to fry your electronics