Introductory Electricity

Describe the force between two charges which is the source of all electric phenomena.

What do you mean by a conductor? and insulator? What types of materials are conductors?

What causes and electric current (amperes) to flow in a wire?

What are the parallels between water flow in a pipe circuit and electric current flow in a DC electric circuit?

What is Ohm's law?

How do you calculate electric current and power in an electric circuit?

How is it that a bird can sit on a high voltage transmission line and not be shocked?

How does a Van de Graaff generator achieve such high voltages?

Why is it dangerous to stand under a tree during a thunderstorm? Why is the lightning more likely to strike the tree than flat earth?

Why does the question "How much voltage does it take to be a shock hazard?" not have a straightforward answer? What is the best measure of the severity of a shock?

How can you measure electric resistance with a voltmeter and ammeter?

Describe the basic layout of standard U.S. household wiring systems. Why are there two high voltage or "hot" wires?

Why are standard U.S. receptacles "polarized" with one wide prong and one narrow prong?

What is the function of a fuse or circuit breaker?

What is the function of a ground wire?

If the ground wire is broken, what indication of this will you get from the operation of the appliance?

Is household wiring in series or parallel? Why?

Why is it that a small amount of corrosion on an auto battery terminal can prevent the engine from starting?

If the auto won't start and you suspect the battery, are the headlights and horn operation a good test of the battery's strength?

Why is it that a battery may test at normal voltage even when it is too spent to supply appreciable power to a circuit?

What is meant by a "short circuit"? an "open circuit"?

*Coulomb's law

*Electric force example

*Conductors and insulators

*Current in wire




*Water circuit analogy

*Ohm's law

*Power relationship

*Voltage law

*Current law

*Bird on high voltage wire

*Van de Graaff generator


*Electric shock

*Voltmeter-Ammeter measurements



*Household wiring

*Polarized plugs

*Breakers and fuses

*Ground wire

*Series circuit

*Parallel circuit

*Auto battery example

*Effect on headlights

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