Hi everyone,
I was thinking about an optics question in a physics textbook. I think the solutions I saw in the solution manual may be wrong.
The question is:
When you do the calculations using
1/p + 1/q = 1/f
you find that the lens first creates an image 400 cm to the...
Thank you for your help. I guess I was thinking in terms of an ideal diode, but in real life the LED's resistance won't go from ∞ to 0 at the critical voltage. Your statement still confuses me a little though: if the LED starts to conduct, shouldn't it's resistance drop? And if it's...
Hi everyone,
I'm new to circuits, and was thinking about using a voltage divider circuit to make a very basic "fire alarm." I've attached an image of what I was thinking. The top resistor is a thermistor.
I'm having trouble figuring out what this circuit will do. My...