early days of the transistor radio!. back in 1954, listening to the radio wherever you went set you...
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Early Days of the Transistor Radio!
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Back in 1954, listening to the radio wherever you went set you back $49.95 (less battery). Marketed as the "world's first pocket radio," the Regency TR-1 was also the first transistor radio. It was jointly developed by Industrial Development Engineering Associates and Texas Instruments and consisted of parts built by various parties scattered throughout the U.S.
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Electric Current
How is Electric Current Made?How do Conductors Differ From Insulators?
What Affects Current Flow?
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Six Vocabulary Terms:
Electric CurrentAMPERE (AMPS)Electric CircuitConductorInsulatorVoltage Resistance
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ELECTRIC CURRENT is the continuous flow of electric charges
through a material.
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The unit we use to measure current is called the AMP.
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An ELECTRIC CIRCUIT is a complete unbroken path that electric charges flow through. A closed, unbroken circuit allows electric charges to flow. An open, broken circuit does not let charges flow.
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A CONDUCTOR is a material that allows electric current to readily flow through it. Metals are the most common conductors.
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The atoms of conductors have loosely bound electrons that can move freely!
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INSULATORS are materials that do not allow electric charges to flow through
them.
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Plastic and rubber make the best insulators.
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Cloth and paper insulation used to be used in most home wiring. This was
called “nob and tube wiring” and is now considered dangerous!
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Current flow is affected by the energy of the charges and the properties of the objects that the charges flow through.
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VOLTAGE or electromotive force can be described as the difference in the amount of possible electric charge between two
points, or the electric potential.
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RESISTANCE is the measure of how difficult it is for charges to flow through
an object.
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As you know, four factors determine the resistance of an object:
*Diameter *Length*Material * Temperature
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As the Length and Temperature of a conductor increase, the resistance of the circuit increases. As the
Diameter of a wire increases, the resistance decreases. Different types of (Materials) conductors
have different resistances.
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Ask Mr. Van Etten to play this link!“Colored Heroes, Valley Forge Maps and a Transistor Radio. (start @ 28:40)
http://www.pbs.org/opb/historydetectives/investigation/first-transistor-radio/