Electric charge - Workforce Solutions

download report

Transcript Electric charge - Workforce Solutions

Electricity
Mrs. Cromwell-Olson
Electric charge
 All matter is made of atoms
 Atoms are made of protons (+), neutrons,
and electrons (-)
 Law of Electric Charges- like charges repel,
and opposite charges attract
 Protons and Electrons thus attract
Electric Force
 Electric Force- the force between charged
objects
 Strength of electric force depends on 2
factors:
• size of the charges
• distance between the charges
 Electric Field- region around a charged
particle that can exert a force on another
charged particle
Electrical Energy / Current
 Cell-
device that produces an electric
current by converting chemical energy to
electrical energy
 Battery- made of several cells
 Potential Difference- a difference in
charge, allows electric current to flow;
measured in volts (V)
 Current- rate at which charge passes a
point; unit is ampere (A)
Current / Resistance
 Direct Current (DC)- charges flow in one
direction
 Alternating Current (AC)- charges continually
switch directions
 Resistance- opposition to flow of electric
charge; unit is ohm
• Resistance depends on the material the wires
are made of
• Thick wires have less resistance than thin
• Short wires have less resistance than long
Electric Power / Circuits
 Electrical power- the rate at which electrical
energy is used to do work
 Power = Voltage x Current
 Circuit- complete, closed path through
which electricity flows
 Series Circuit- all parts are connected in a
single loop (p.442)
 Parallel Circuit- different loads are located
on different branches (p. 443)

This workforce solution was funded by a grant awarded under Workforce Innovation in Regional
Economic Development (WIRED) as implemented by the U.S. Department of Labor’s Employment and
Training Administration. The solution was created by the grantee and does not necessarily reflect
the official position of the U.S. Department of Labor. The Department of Labor makes no guarantees,
warranties, or assurances of any kind, express or implied, with respect to such information,
including any information on linked sites and including, but not limited to, accuracy of the
information or its completeness, timeliness, usefulness, adequacy, continued availability, or
ownership. This solution is copyrighted by the institution that created it. Internal use by an
organization and/or personal use by an individual for non-commercial purposes is permissible. All
other uses require the prior authorization of the copyright owner.