Chapter 19: DC Circuits
Physlet® Problems




1.  

Two resistors are connected to a battery as shown.  Find the unknown resistance.   You can read component values by placing the mouse cursor over a component.  Start.

20 W.
40 W.
60 W.
90 W.


2.  

Three resistors are connected to a battery as shown.  How much current is flowing from the battery?  You can read component values by placing the mouse over a component.  Start.

0.10 A.
0.15 A.
0.20 A.
0.25 A.


3.  

A variable resistor, Rl, is connected to a battery consisting of an emf and an unknown internal resistance, Rx.  Find the unknown resistance.   You can vary the load resistance using the slider.  Start.

More Help.

20 W
40 W.
60 W.
80 W.


4.  

A variable resistor, RL, is connected to a battery consisting of an emf and an unknown internal resistance, Rx.   Find the unknown resistance.   You can vary the load resistance using the slider.  Start.

20 W.
40 W.
60 W.
80 W.


5.  

Can you tell if  the switch is open or closed?  Place your mouse on a component to measure values.  Start.

Closed
Open
Can't tell.


6.  

Three identical light bulbs are connected as shown but one light bulb is burned out.  Which bulb is it? You can read component values by placing the mouse over a component.  Start.

Bulb 1.
Bulb 2.
Bulb 3.
Either bulb 2 or bulb 3.


7.  

Three identical light bulbs and a switch are connected as in figure 19-7 in Giancoli. The open switch readings are correct but only one of 4 possible sets of values is correct with the switch closed.  Which set of readings is correct?  You can read values by placing the mouse over a component. 

Start with an open switch.

Close the switch.
Close the switch.
Close the switch.
Close the switch.


8.  

Four identical resistors are connected as shown.  You can read  values by placing the mouse on a circuit element. Which set of readings is correct? 

Circuit readings.
Circuit readings.
Circuit readings.
Circuit readings.


9.  

What will happen to the ammeter and voltmeter readings when the switch is closed? Start.

The voltmeter reading will decrease because  there are more paths for current to get around the voltmeter to the battery.
The ammeter reading will increase because there are more paths for current to get through the circuit.
The ammeter reading will increase and the voltmeter reading will remain the same because voltmeters have high resistance.
Neither meter will change readings.


10.  

How long has the capacitor been charging? Assume that the capacitor was completely discharged the instant the switch was closed.  You can read component values by placing the mouse over a component.  Start.

2 ms.
2.8 ms.
4 ms.
5.5 ms.


11.  

The circuit above is programmed to display values at 10 ms,  20 ms, 20, and  40 ms after the switch is closed.  You may read these values by resting the mouse cursor on the component   Find the value of the capacitor.

0.2 mF.
0.3 mF.
0.4 mF.
0.5 mF.

Physlets used by permission of Wolfgang Christian, Davidson College. Physlet Problems ©Prentice Hall, Inc; written by Aaron Titus (North Carolina State University) and Wolfgang Christian, Davidson College.


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