Chapter 28: Q. 7 (page 790)
What is the resistance of a hair dryer? What is the current in the hair dryer when it is used?
Short Answer
and.
Chapter 28: Q. 7 (page 790)
What is the resistance of a hair dryer? What is the current in the hair dryer when it is used?
and.
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Get started for freeA capacitor is discharged through two parallel resistors,and By what factor will the time constant of this circuit increase if the resistors are instead placed in series with each other?
The capacitors in are charged and the switch closes at At what time has the current in the resistor decayed to half the value it had immediately after the switch was closed?
For an ideal battery, closing the switch in FIGURE P28.54 does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that thebattery has an internal resistanceand that the resistance of a glowing bulb is.
a. What is the current through bulb A when the switch is open?
b. What is the current through bulb A after the switch has closed?
c. By what percentage does the current through A change when the switch is closed?
A circuit you’re using discharges a capacitor through an unknown resistor. After charging the capacitor, you close a switch at and then monitor the resistor current with an ammeter. Your data are as follows:
Use an appropriate graph of the data to determine
(a) the resis-tance and
(b) the initial capacitor voltage.
What is the equivalent resistance between points a and b in FIGURE EX28.25?
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