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Magnetic fields do, because there's no such thing as an isolated magnetic "pole",
and a magnetic line always starts and ends at opposite poles of the same
magnetized object.
But electric fields don't. You can easily have a bundle of isolated positive charge
over here and a bundle of isolated negative charge over there, whereupon the
lines of the electric field start on one bundle and end on the other bundle.
But electric field lines can also exist in closed loops, and they do that in radio waves, where the electromagnetic field propagates with an electric field component and a magnetic field component, and they both form closed loops.
True
an insulator
voltage
A voltage source of 120 V will supply a current of 6 Ainto a load of 20 ohms.
Ohm's law: Voltage equals current times resistance.
The alternate question, 10 ohm heater running on 120 V, was split from this question because it was not the same question.
Most great discoveries started out as accidental. The discoverer usually wondered why something happened and began investigating and experimenting to learn about it.
an increase in current, hence increased power and increased heat.
Magnetic fields can be created by charges or the flow of current.
False. The atom that has the same number of protons as it has electrons is a neutral atom.
You would need to be standing on some kind of electrical insulator, such as a rubber mat, or on very dry ground.
wait for someone from the power company to come ant help - APEX;0
