Power — adapters, plugs, and not frying your charger
Norway uses Type F plugs, 230 V, 50 Hz. American devices need an adapter; nothing else.
This is the shortest article in the section, because the answer is short: bring an adapter, and don’t overthink the rest.
The plug
Norway uses the Type F plug — the round two-pin “Schuko” standard used across most of continental Europe. It does not fit an American Type A or B plug. You need a physical adapter that converts the flat American pins to the round European ones. That is the one thing you genuinely cannot do without.
The voltage
Norway runs on 230 volts at 50 hertz. The United States runs on about 120 volts at 60 hertz. This sounds like it should matter more than it does, because of one quiet fact: almost every modern electronic device handles both. Phone chargers, laptop chargers, camera chargers, tablet chargers, electric toothbrushes, most modern shavers — nearly all of them are built for the whole 100–240 V range.
You can confirm it in five seconds. Look at the small print on the charger or its plug block. If it reads something like “INPUT: 100–240V ~ 50/60Hz”, the device is dual-voltage and a plain plug adapter is all it needs. Essentially every charger you own will say this.
What can actually go wrong
The exceptions are heat-and-motor appliances that are not dual-voltage — most often older hair dryers, curling irons, and flat irons rated for 120 V only. Plugged into Norwegian 230 V through a simple adapter, those will run too hot, burn out, or trip a breaker. A plug adapter does not change the voltage; only a heavier (and bulkier) voltage converter does that, and it is rarely worth carrying.
The simple fix: leave the old single-voltage styling tools at home. Most accommodations supply a hair dryer, and any styling tool bought for travel today is dual-voltage. Check the label before packing anything that heats up.
How many to bring
Bring at least one adapter per traveler, and a spare or two for the group — they are small, cheap, and the thing most likely to be left in a hotel-room outlet. A small multi-port USB charger plus one adapter can also power several phones from a single wall socket, which cuts down on how many adapters the group needs at once.
If you forget
If an adapter gets left behind, Clas Ohlson — a Scandinavian hardware-and-household chain found in city centers all over Norway — sells them cheaply, as do airport shops and many supermarkets. Forgetting an adapter is an inconvenience, not a crisis.