Chapter 17: Introduction to Electricity. Review. 1. Definitions:. law of electric charges (like charges repel and opposite charges attract) electric force (the force between charged objects), electric field (space surrounding electrically charged particles),
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i) voltage (potential difference between two points in a circuit),
j) resistance (the opposition to the flow of electric charge),
k) electric power (the rate at which electrical energy is converted into other forms of energy),
l) series circuits (all parts are connected in a single loop),
m) parallel circuits (loads are connected-side-by side).
electrons move between objects by direct contact
rearrangement of charges in an uncharged object without direct contact
transfer of charge through rubbing/wiping
plastic, rubber, glass, wood, etc.
copper, aluminum, mercury, etc.
charges continually change direction
Applications: houses (AC changes direction 120 times a second)
charges flow in the same direction.
Ohm’s law: V = I * R
electrical power: P = V * I
electrical energy (E = P * t)
1. energy source