• Conductors - keep loose grip on
their electrons and allow electrons to move freely. Metals are usually good
conductors.
• Insulators - keep close hold of
their electrons and do not allow free movement of electrons. Glass, wood,
plastic, mica, fiberglass and air are good insulators.
• Electromotive Force (EMF) is the
force that moves electrons through conductors. Its unit of measure is the Volt.
Think of it as pressure.
• Voltage Source - has two
terminals (+ and -). Some examples are car batteries (12 volts DC), D cell
batteries (1.5 volts DC) and a wall socket (120 volts AC).
• Current -
is the flow of electrons. It is measured in amperes.
• Resistance
(ohms, Ω)
is the ability to oppose an electrical current.
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