(I'm lucky to have a computer ... It was only through the miracle of modern digital technology that I was able to flip your photo right- side-up to where I could read it.)
Here's how to figure out things like this:
The circle on the left side labeled ' <em>G</em> ' is the <em><u>G</u></em>enerator or battery that powers this whole circuit and all the devices in it. In order for any device to work, you need to be able to set your pencil down at the top of the Generator, and find a path through the circuit and through that device, where current can flow all the way around to the bottom of the Generator. If you ever come to an open switch, then current stops there, and you have to find another way through. If the path you found takes you back to the bottom of the generator but it doesn't go through one of the devices, then that device doesn't work.
Look at the picture. If you open switch S-4, then Device-4 can't work, because current can't go through it from one end of the Generator to the other end. But all of the other devices still work.
I can see 2 ways to turn off Device-3 with a single switch ... either open switch S-5, or else open switch S-1. Unfortunately, I think either way will shut off all 5 devices.
Inverse Square Law Newton proposed the Inverse Square Law. The effect of gravity (and also on forces such as sunlight) works like this. If say we have a half-mass Earth, it would produce a gravity of not half but a quarter (the square of 2).
The wavelengths of radio waves are much "Longer" than the wavelength of microwaves therefore, radio waves carry much "Lower" <span>energy than a microwave.
