The Republic of Equatorial Guinea is a country in Central Africa.
If you are planning on traveling to Equatorial Guinea with some of your personal electronic appliances, you will not be able to use them unless they are designed for 220v electrical current. Most countries outside of the Americas use 220v, including Equatorial Guinea. If you are going to Equatorial Guinea, be prepared for 220v by bringing dual-voltage appliances. If an electronic device is dual-voltage, it means that it accepts both 110v and 220v electrical current. It will indicate this by showing a 110v-220v voltage rating on its indication panel.
But if you do not own any dual-voltage appliances, and don’t want to buy any, you can buy voltage converters for your single-volt appliances.

Voltage converters attach to your electrical devices and regulate the electrical current coming out of outlets that use 220v. Without a voltage converter, your single-volt appliances are a safety hazard. They will not work, and may cause a fire. If you want to buy voltage converters for the single-volt appliances you are bringing with you to Equatorial Guinea, find the wattage rating on the appliances. If it isn’t listed, just multiply the voltage by the amp. When you have this wattage number, buy a voltage converter that is 25% higher in wattage than the appliance you intend to use it with.

Equatorial Guinea also uses two different types of electrical plugs. One of them is the American style plug that you are probably used to. However, another type of plug is also used in Equatorial Guinea, with three cylindrical prongs. Bring a plug adapter designed to fit these outlets in case you do not come across any American-style ones.

References:
Equatorial Guinea plug adapter
Equatorial Guinea voltage converter

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Great Britain is part of the constitutional monarchy of the United Kingdom of Great Britain and Northern Ireland. Great Britain consists of the larger island in the British Isles, the smaller one being Ireland. In order to use electronics from the United States in Great Britain , as well as most other countries outside of the American continent, you need two things, a voltage converter and a plug adapter, unless you have dual-voltage electronics. Dual-voltage electronics will work in other countries that use 220v, without a voltage converter. Most countries in Europe, Asia, Africa, and Australia use 220v. North America, most of Central America, and much of South America uses 110v. Great Britain is a country that uses 220v. The rest of Europe mostly uses 220v as well. If you are traveling to Great Britain , be sure to bring either a voltage converter or dual-voltage appliances. If you try to use single-volt appliances in Great Britain , you could cause a fire. But how do you know if your electronics are dual-volt or single-volt?

Look for the voltage rating directly on your appliance. If it says 110v, then it is a single-volt appliance. In this case, find the wattage by either looking on the appliance, or multiplying the voltage by the amp. Then, buy a voltage converter for this appliance that has a wattage at least 25% higher than the appliance. This helps the voltage converter to last longer.

But if you found a voltage rating on your appliance that listed 110v-220v, then it is dual-volt. You do not need a voltage converter for these appliances to function in Great Britain and other countries that use 220v electrical current.

However, even if you are bringing dual-voltage electronics with you to Great Britain , you still need a plug adapter, because Great Britain uses a different type of plug than the Americas. But be careful when buying your plug adapter, because there are six different types of plug adapter corresponding to the six different international plug types, and if if you get the wrong one, it won’t work in Great Britain . So be sure to buy the correct one.

References:
Great Britain plug adapter
Great Britain voltage converter