I recently bought this resistor: http://www.radioshack.com/product/index.jsp?productId=12573233 I want to hook it up to about 50V DC, but I want to know if this would be harmful to the resistor. According to the description it can handle up to 800V, but its power rating is only 25W. This doesn't make sense to me, because according to that power rating even a 9V battery would break it. Anyone know how to reconcile the two? Would 50V be okay?