22 terms

Electricity is fundamentally

charges, both positive and negative

Energy is

work

The are just as many ____ in both a conductor and insulator

positive and negative charges

In a good conductor, the electrons

move easily, like liquid water (electron sea)

In a good insulator, the electrons

are stuck in place, like frozen water

Like charges ___ and opposite charges ___

repel, attract

Electrostatic fields create

static cling, lightning bolts, etc

An accumulation of charges is what we call

voltage

Movement of charges is what we call

current or amperage

Energy is

work

in a circuit the electromagnetic effects

move energy from one point to another

Always consider units in your equations; they can help you make sure you are getting the right answer.

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Use units to create the right equation to solve the problem. Do this by making a unit equation and canceling units until you have the result you want.

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Use estimation to determine approximately what the answer should be as you are analyzing and troubleshooting; then compare that to the results to identify mistakes.

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Power =

Voltage x Current

The function of a resistor in an electrical circuit is equal to

friction. The resistor resists the ﬂow of electricity just like friction resists the speed of the box. And, guess what? It heats up as it does so. An equation called

Ohm's Law describes this relationship:

resistance = voltage / current

Ohm's Law describes this relationship:

resistance = voltage / current

Ohm's Law

resistance = voltage / current

law of inertia

You notice that it takes some work to get the box going, but once it's moving, it coasts along nicely. In fact, it takes work to get it to stop again. How much work, depends on how heavy the box is.

Mass resists a change in speed. Correspondingly, inductance resists a change in

current.

mass = (force * time) / speed

inductance = (voltage * time) / current

mass = (force * time) / speed

inductance = (voltage * time) / current

Capacitor

has the capacity to store energy. (similar to a spring)

capacitance = (current * time) / force

capacitance = (current * time) / force

The inductor is the inverse of

the capacitor

6 Basic Formulas

■ Ohm's Law

■ Voltage divider rule

■ Capacitors impede changes in voltage

■ Inductors impede changes in current

■ Series and parallel resistors

■ Thevenin's theorem

■ Voltage divider rule

■ Capacitors impede changes in voltage

■ Inductors impede changes in current

■ Series and parallel resistors

■ Thevenin's theorem