# Chapter 23

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question
Just as in hydraulic circuits there is water pressure, in electric circuits there is
voltage
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To think of electric potential difference we are thinking about
voltage
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Voltage is most similar to
pressure
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A suitable electric pump in an electric circuit is a
both of these
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It is correct to say that in electric circuits
all of the above
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Unit of electric resistance
Ohm
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If two copper wires of the same length have different thickness, then the thicker wire has
less resistance
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If you stretch a copper wire so that it is thinner, the resistance between its ends
increases
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When you turn on a lamp, the initial current in its filament is greater at first, rather than a moment later, which indicates
increased temperature means increased resistance.
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Electric resistance in our skin is lowered when our skin is
moist
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The voltage across a 10-ohm resistor carrying 5 A is
more than 20
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The current in two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
220 ohms
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Alternating current is normally produced by a
generator
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A capacitor is useful in
smoothing pulsed current
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For electric current in the home, your power company supplies
energy
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The source of electrons that illuminate a common lamp in your home is
atoms in the lamp filament
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Electrons that are energized to glow in the filament of a common ac lamp are
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When Eddie Electron experiences an electrical shock, the source of electrons composing the shock is
Eddie's body
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Electrons flow in an electric circuit by
Interacting with an established electric field
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The electric field established by a generator in an ac circuit
changes magnitude and direction with time
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In units of measurement, power in watts is equal to
amperes x volts
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One kilowatt is a unit of
power
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The electric power supplied to a lamp that carries 2 A at 120 V is
240 Watts
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A 100-W lamp glows brighter than a 25-W lamp. The current drawn by the 100-W lamp is
greater
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The energy dissipated in a light bulb in a circuit is provided by the
voltage source
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A 60-W light bulb connected to a 120-V source draws a current of
0.5 A
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A power line with a resistance of 2 ohms carries a current of 80 A. The power dissipated in the line is
12,800 W
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The power dissipated in a 4-ohm resistor carrying 3 A is
36 W
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The current drawn by a 1200-W toaster connected to 120 V is 10 A. The resistance of the toaster coils is
12 ohms
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A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is
\$4.40
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A lamp rated 23W 120V means that it will deliver 23 W
when the voltage across it is 120 V.
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The amount of current in an incandescent bulb rated 75W 120V is about
0.6 A
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Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is
The same
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By convention, the direction of current in a circuit is
both of these
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When two lamps are connected in series to a battery, the electrical resistance that the battery senses is
more than the resistance of either lamp
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When a pair of identical lamps are connected in parallel
all of the above
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Modern automobile headlights are connected in
parallel
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The safety fuse in an electric circuit is connected to the circuit in
series
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Something in the current in lamps is too feeble to produce glowing of the lamp filaments, which occurs when
Too many lamps are connected in series
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As more lamps are connected in a parallel circuit, the overall current in the power source