Hello. My wife and I just purchased a home built in 1905. It has an updated 100 amp breaker box. The house has a large addition that has new radiators and wiring. It looks like some of the original house has some of the knob and tube still active.

How can I test and what type of tester can I use to see what wires and outlets are live?

Also, the house has several ceiling fans on the upper level we want to replace. How can I tell if this wiring is the knob and tube when I look at the wiring?

Is it possible to find what breakers the knob and tube is connected to and basically just turn on all the lights, plug lamps into every outlet in the house. Then just shut off breakers and see which go where?