ScienceEngineeringPHY 110 Chapter 23
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PHY 110 Chapter 23

Jeffrey Edwards avatar Jeffrey Edwards
25 July 2022
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A 4-ohm resistor is connected in parallel with a 6-ohm resistor. This combination produces an equivalent resistance of
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2.4 ohms
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Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is
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the same in both lamps
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Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is
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the same in each lamp.
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A circuit breaker often serves the same purpose as a
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Fuse
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Heat a copper wire and its electric resistance
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Increases
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The electric resistance in a length of wire is doubled when the wire is _____
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twice as long
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When your body undergoes electric shock, the source of moving electrons is ______
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electrons already in your body
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What is the relationship between current, resistance, and voltage difference?
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Current = Voltage Difference / Resistance
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How does the current change if you increase the resistance, keeping the voltage difference the same?
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The current decreases
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What factors does the resistance offered by a piece of conductor depend upon?
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both the geometry and the material of the conductor
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How does the resistance of a thick piece of copper wire compare to the resistance of a thin piece of copper wire?
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The resistance of the thin piece is greater than that of the thick piece.
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What is the current in a bulb if the resistance of its filament is 2 ohms and it is connected across a 6-volt battery?
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3 amps
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What does the power company provide to our homes?
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It provides energy to move the electrons.
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Of what physical quantity is Hertz a unit of?
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number of times per second that the electrons move back and forth in the wire.
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What type of field causes the electrons to do what they do in the wire?
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electric fields
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What kind of current runs through the electric wiring in a home?
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alternating current
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Electric power in a circuit is the rate at which
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energy dissipates
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When the filament breaks in one lamp in a series circuit, other lamps in the circuit normally
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go out
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When the filament breaks in one lamp in a parallel circuit, lamps in other branches of the circuit normally
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continue glowing as brightly.
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Stretch a copper wire so that it is thinner and the resistance between its ends
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increases
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The primary source of electrons in an ordinary electrical circuit is
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the electrical circuit itself.
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he electric power of a lamp that carries 2 A at 120 V is
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240 watts
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Modern automobile headlights are connected in
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parallel
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A capacitor is useful in
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smoothing pulsed current
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When we say an appliance "uses up electricity," we really are saying that
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electron kinetic energy is changed into heat
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If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster will be about
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twice what it should be