At my workplace give away, I found a bunch of sensors for free (sun founders kit). Unfortunately, the box that contains more than 20 sensors did not have a resistor in it.

I wish to connect a few sensors, namely a temperature sensor and a photo resistor; but connecting them to the rasp pi via breadboard without a resistor. Do you think could cause something to blow up in my rasp pi?

I don't want to destroy my rasp pi.