Voltage in Spain is 220 V, similar to almost all European countries. However, in many nations including most part of America, Japan and others, the voltage is different. Therefore, you should be very careful with any electric device you bring to Spain. You may also need a plug adaptor.
Plugs and Electrical sockets (outlets)
In Spain, there are Schuko (Type F) and Europlug (Type C)plugs. Schuko plugs have two round pins of 4,8 mm diameter and some earthing clips in the upper and lower part. In turn, Europlugs are flat, also with two round pins, and normally found in low-power devices.
The United Kingdom, Cyprus, Ireland and Malta use different plug types as do many North and South American and Asian countries.
Adaptors can easily be purchased in Spain at electrical supply or hardware stores. They cost between EUR2 and EUR5.
If coming from America or certain areas from Africa and Asia, it is probable your electric devices are 110 or 120 V, instead of being 230 V. Voltage does not have nothing to do with plug type, even if the plug fit into the socket, if device is not 230 V, it may not work and lead to a breakdown.
A transformer is a device used to increase or diminish voltage of an electric circuit. Transformers are slightly more expensive than plugs adaptors. However, it is essential, as the connection of a device 110 V or 120 V to a Spanish socket can lead to the burning of fuses or cause a breakdown. When choosing a transformer pay attention to the watts as using the wrong wattage can cause electrical malfunctions.
ATMs are easy to find so there is no need to bring a lot of cash with you.