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# Electricity

Get electricity reviews and study guides here. Learn about electricity or brush up on your skills. Thorough explanations and practice examples will help you review physics.

### Study Guides

showing 11 - 20 of 26
• 11.

#### Phase Angle Help

Introduction Phase angle is an expression of the displacement between two waves having identical frequencies. There are various ways of defining this. Phase angles are usually expressed as values φ such that 0° ≤ φ < ...

Source: McGraw-Hill Professional
• 12.

#### Alternating Current Practice Test

Review the following concepts if needed: Alternating Current Help

Source: McGraw-Hill Professional
• 13.

#### Inductance Help

Introduction In dc electrical circuits, the relationship among current, voltage, resistance, and power is simple. The same is true for ac circuits as long as those circuits do not store or release any energy during the course of each current ...

Source: McGraw-Hill Professional
• 14.

#### Inductive Reactance Help

Introduction In dc circuits, resistance is a simple thing. It can be expressed as a number ranging from zero (a perfect conductor) to extremely large values, increasing without limit through thousands, millions, and billions of ohms. ...

Source: McGraw-Hill Professional
• 15.

#### Capacitance Help

Introduction Capacitance impedes the flow of ac charge carriers by temporarily storing the energy as an electrical field. This energy is given back later. Capacitance generally is not important in pure dc circuits, but it can have significance ...

Source: McGraw-Hill Professional
• 16.

#### Capacitive Reactance Help

Introduction Inductive reactance has its counterpart in the form of capacitive reactance . This, too, can be represented as a ray starting at the same zero point as inductive reactance but running off in the opposite direction, having ...

Source: McGraw-Hill Professional
• 17.

#### RLC Impedance Help

Introduction We’ve seen how inductive and capacitive reactance can be represented along a line perpendicular to resistance. In this section we’ll put all three of these quantities— R, X

Source: McGraw-Hill Professional
• 18.

#### More About Alternating Current Practice Test

Review the following concepts if needed: Inductance Help

Source: McGraw-Hill Professional
• 19.

#### Physics and Current Help

Current Whenever there is movement of charge carriers in a substance, there is an electric current . Current is measured in terms of the number of charge carriers , or particles containing a unit electric charge, passing a ...

Source: McGraw-Hill Professional
• 20.

#### Ohm's Law Help

Ohm's Law The interdependence among current, voltage, and resistance in dc circuits is called Ohm’s law , named after the scientist who supposedly first expressed it. Three formulas denote this law:

Source: McGraw-Hill Professional

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