Will a lower current device ruin a Pi?

The Raspberry Pi is a series of credit card-sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation to promote the teaching of basic computer science in schools and developing countries.

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Will a lower current device ruin a Pi?

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First time working on a Raspberry Pi project, and realizing that I am lacking the EE knowledge needed. I'm trying to build a temperature controlled fan. I found these instructions, which seem pretty good, but I'm struggling with finding a 12V fan that is also 600mA. All the fans I am finding are lower wattage, aka lower current. Do I need to worry about damaging the Pi if I use a lower wattage fan?
Also, is there a good kit (I already have a Raspberry Pi 2) that gives things like wires, transistors, etc? Trying to buy 1 diode, 1 transistor, 1 resistor, and a few wires is painful.
Thanks in advance!

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