yES AND No
Positive numbers, on your door. Negative in your freezer.
Well, a negative connotation of house might be 'shack', and a positive connotation can be 'mansion'.
In the United States, generally negative. Americans associate having house servants with slavery, which gives the practise a negative connotiation. In other cultures, it can be more positive, especially when the servant is not a house servant. "Well done, thou good and faithful servant" or "Civil Servant" do not have the negative connotation.
A neutron. Those with a negative charge are electrons, and those with a positive charge are protons.
No, not the battery. But anything that has a diode, transistor or is in any other way dependent on polarity may be fried... including your alternator.
The only really positive effect is that they attract other birds. However, most birders think that their negative effects out weigh their good ones.
Presuming you're asking about household type wiring, anything not white or green is "hot". House power is Alternating Current (AC), which means that it turns around and goes the other way 60 times a second. So it's positive, but then it's negative, then it's positive again. Since you phrased the question the way you did, perhaps you should pay someone who's trained not to electrocute themselves to do whatever is required. Good question though!
It has both effects. The affect of low level ozone is certainly negative. Breathing issues for the elderly or those with health issues is bad. High altitude ozone helps us keep the planet warm (global warming) and filters out much of the ultra violet radiation that would otherwise hurt us.
The cars can produce pollution which leads to green house effects. Also the cars can kill because of careless driving.
it was made out of glass... green house.. get it.?
The Green House was created in 1966.
Most likely your "purple" was once black, and is the negative; to verify, trace "purple" to ground, or touch the leads of an ohmmeter to purple and ground. You should get "0" ohms at the correct wire. This assumes a negative ground.