In procedure 1: four resistors are connected in series, and the entire group is
ID: 2009330 • Letter: I
Question
In procedure 1: four resistors are connected in series, and the entire group is connected across a battery.a) If the difference in potential across the battery increases, what will happen to the current through the other resistors?
The current in all resistors will increase
You cannot tell, since it depends on the resistors used.
The current in some resistors will increase, and some will decrease
The current in all resistors will decrease
The current in all resistors will remain the same
b) Suppose a fifth resistor is added to the circuit, in series with the other four reistors. What will happen to the current in the other four resistors?
The current in some resistors will increase, and some will decrease
You cannot tell, since it depends on the resistors used.
The current in all resistors will increase
The current in all resistors will remain the same
The current in all resistors will decrease
c) In the circuit: to measure voltage across a resistor you would
Place the contacts of the voltmeter across the short
Remove the resistor, and place the voltmeter across the white jacks
Remove the short, and place the voltmeter across the yellow jacks
Place the contacts of the voltmeter across the resistor in the circuit
You cannot tell, since it depends on the resistors used.
d) In the circuit: to measure the current through a resistor you would
Remove the resistor, and place the voltmeter across the white jacks
Place the contacts of the voltmeter across the resistor in the circuit
Place the contacts of the voltmeter across the short
You cannot tell, since it depends on the resistors used.
Remove the short, and place the voltmeter across the yellow jacks
Explanation / Answer
The four resistors have a combined value of Rtot = R1+R2+R3+R4 Let battery difference potential be called V. Use I for current.
a. If the difference in potential across the battery increases, what will happen to the current through the other resistors?
-The current in all resistors will increase. I = V/Rtot
b. Suppose a fifth resistor is added to the circuit, in series with the other four reistors. What will happen to the current in the other four resistors?
-The current in all resistors will decrease. Rtot is now R1+R2+R3+R4+R5, so V/Rtot is a smaller #.
c. In the circuit: to measure voltage across a resistor you would
-Place the contacts of the voltmeter across the resistor in the circuit
d. In the circuit: to measure the current through a resistor you would
-Remove the resistor, and place the voltmeter across the white jacks
or
-Remove the short, and place the voltmeter across the yellow jacks