151Alternating current, or AC, is characterized by what behavior?
152Direct current, or DC, is characterized by what behavior?
153A transformer is mainly used in electrical systems to change what?
154A step-up transformer changes an alternating voltage by doing what to it?
155A step-down transformer changes an alternating voltage by doing what to it?
156Magnetic field lines around a bar magnet are generally described as emerging from which pole?
157When two magnets are brought close together, like magnetic poles will do what to each other?
158Earth behaves like a giant magnet, with its magnetic poles located roughly near what?
159A magnetic compass needle generally aligns itself to point toward what direction?
160An electromagnet is typically created by passing electric current through a coil of wire wound around what?
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