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6 6 Electricity
A thunderstorm produces an interesting display of electrical discharge.
Each bolt can carry over 150,000 amperes of current with a voltage
of 100 million volts.
CORE CONCEPT
Electric and magnetic fields interact and can produce forces.
OUTLINE
6.1 Concepts of Electricity
Static Electricity
Electron Theory of Charge
Static electricity is an electric Electric Charge Measuring Electrical Charge
charge confined to an object Static Electricity The size of a static charge is
from the movement of electrons. Electrical Conductors and Insulators related to the number of electrons
Measuring Electrical Charges that were moved, and this can be
Electrostatic Forces measured in units of coulombs.
Force Fields
Electric Potential
Force Field
6.2 Electric Current
The space around a charge is Electric Potential
The Electric Circuit
changed by the charge, and this The Nature of Current Electric potential results when
is called an electric field. Electrical Resistance work is done moving charges into
Electrical Power and Electrical Work or out of an electric field, and
People Behind the Science: Benjamin Franklin the potential created between
The Electric Circuit 6.3 Magnetism two points is measured in volts.
Magnetic Poles
Electric current is the rate at Magnetic Fields
which charge moves. The Source of Magnetic Fields
Permanent Magnets Source of Magnetic Fields
Earth’s Magnetic Field A moving charge produces a
6.4 Electric Currents and Magnetism magnetic field.
Current Loops
Applications of Electromagnets
Electric Meters
Electromagnetic Switches
Electromagnetic Induction Telephones and Loudspeakers
A changing magnetic field Electric Motors
causes charges to move. 6.5 Electromagnetic Induction
A Closer Look: Current War
Generators
Transformers
6.6 Circuit Connections
Voltage Sources in Circuits
Science and Society: Blackout Reveals Pollution
Resistances in Circuits
A Closer Look: Solar Cells
Household Circuits 139
