Chapter 4: Q13DQ (page 947)
In the circuit figure when switch S is suddenly closed, the wire L is pulled toward the lower wire carrying current I. Which (a or b) is the positive terminal of the battery? How do you know?
The current flow from right to left that’s why pointis positive terminal of the battery.
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The battery for a certain cell phone is rated at.According to the manufacturer it can produceof electrical energy, enough for of operation, before needing to be recharged. Find the average current that this cell phone draws when turned on.
Copper has free electrons per cubic meter. A 71.0-cm
length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 A of
current. (a) How much time does it take for an electron to travel the length
of the wire? (b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm)
of the same length that carries the same current. (c) Generally speaking,
how does changing the diameter of a wire that carries a given amount of
current affect the drift velocity of the electrons in the wire?
BIO Transmission of Nerve Impulses. Nerve cells transmit electric
signals through their long tubular axons. These signals propagate due to a
sudden rush of ions, each with charge , into the axon. Measurements
have revealed that typically about ions enter each meter of the
axon during a time of . What is the current during this inflow of charge
in a meter of axon?
The text states that good thermal conductors are also good electrical conductors. If so, why don’t the cords used to connect toasters, irons, and similar heat-producing appliances get hot by conduction of heat from the heating element?
A battery-powered global positioning system (GPS) receiver operating 9.0 V on draws a current of 0.13 A. How much electrical energy does it consume during 30 minutes?
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