Recently I learned about NPN transistors in my physics class, and am having difficulty understanding them. I read about them in the AAC textbook, but some things still don't make sense to me very well.
If a transistor is used as a switch, is it true that there is an inverse relationship between the power going into the base leg and the power coming out of the emitter leg? An LDR has resistance that is inversely proportional to light, so it has the opposite of the behavior desired for a light that should only go on at night (like a streetlight). Would wiring it to the base leg of a transistor cause it to produce the desired behavior (so that the transistor would emit the most power when it is dark and the LDR is producing the most resistance)?
If a transistor is used as a switch, is it true that there is an inverse relationship between the power going into the base leg and the power coming out of the emitter leg? An LDR has resistance that is inversely proportional to light, so it has the opposite of the behavior desired for a light that should only go on at night (like a streetlight). Would wiring it to the base leg of a transistor cause it to produce the desired behavior (so that the transistor would emit the most power when it is dark and the LDR is producing the most resistance)?