A1:
| Answer B is correct. Schematics are line drawings of electrical circuits and their components. A sketch is a hand-drawn rendering; current is a measurement in a circuit; a transistor is an electronic component. Therefore, answers A, C, and D are incorrect. |

A2:
| Answer A is correct. Free electrons are the particles responsible for producing an electrical current. Protons and neutrons comprise the nucleus of an atom. Therefore, answers B, C, and D are incorrect. |

A3:
| Answer D is correct. You use Ohm's Law to determine voltage across a line. Newton defined the law of gravity; Kepler was an early astronomer; and Fleming defined the rules of magnetism. Therefore, answers A, B, and C are incorrect. |

A4:
| Answer B is correct. Current is ... |

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