So I'll be making a robotic hand, closely modeled too a human one. I'll be experimenting with unusual actuation methods such as shape memory alloys. I'm prototyping fingers now, but it'll probably pick up pace around next fall. Dual-action muscle wire finger tested. Next up, SMA strips.
Its the most commonly available shape memory alloy. Yes the resistance of the wire causes it to heat up, and it contracts when heated. Here is a link to some more info: http://robotics.hobbizine.com/flexinol.html
I am using the .006" type. Thicker wire has greater force, but cools slower. Next I may try some SMA strips, which can be “programed” to go to a set position when heated instead of simply contracting.