Physics Chapter 18
If the potential difference across a pair of batteries used to power a flashlight is 6.0 V, what is the potential difference across the flashlight bulb?
6.0V
What is the equivalent resistance of 3 Ω, 7 Ω, and 13 Ω resistors when they are all conneted in parallel?
1.8Ω
If the batteries in a portable CD player provide a terminal voltage of 12 V, what is the potential difference across the entire CD player?
12V
If a 9.0V battery is connected to a lightbulb, what is the potential difference across the bulb?
9.0V
If the potential difference across the bulb in a camping lantern is 9.0 V, what is the potential difference across the battery used to power it?
9.0V
Three resistors with values of R1 , R2 , and R3, are connected in series, Which of the following expresses the total resistance, Req , of the three resistors?
Req =R1 +R2 +R3
Three resistors connected in parallel carry currents labeled I1 , I2 , and I3 . Which of the following expresses the total current It in the combined system?
It=I1+I2+I3
Three resistors connected in series carry currents labeled I1 , I2 , and I3 , respectively. Which of the following expresses the total current, It , in the system made up of the three resistors in series?
It=I1=I2=I3
Three resistors with values of R1 , R2 , and R3, are connected in parallel. Which of the following expresses the total resistance, Req , of the three resistors?
Req=((1/R1)+(1/R2)+(1/R3))^-1
A circuit is composed of resistors wired in series. What is the relationship between the equivalent resistance of the circuit and the resistance of the individual resistors?
The equivalent resistance is equal to the sum of the individual resistances.
Two resistors having the same resistance value are wired in parallel. How does the equivalent resistance compare to the resistance value of a single resistor?
The equivalent resistance is half the value of a single resistor.
What happens when the switch is closed in the circuit shown above?
The lamp goes out, because the battery terminals connect to each other.
How does the potential difference across the bulb in a flashlight compare with the terminal voltage of the batteries used to power the flashlight?
The potential difference is equal to the terminal voltage.
A circuit has a continuous path through which charge can flow from a voltage source to a device that uses electrical energy. What is the name of this type of circuit?
a closed circuit
In any complex resistance circuit, the voltage across any resistor in the circuit is always
equal to or less than the voltage source.
To find the current in a complex circuit, it is necessary to know the
equivalent resistance of the circuit.
Which of the following is the best description of a schematic diagram?
shows the parts of a circuit and how the parts connect to each other
The equivalent resistance of a complex circuit is usually determined by
simplifying the circuit into groups of series and parallel circuits.
Three resistors connected in series have potential differences across them labeled ∆V1 , ∆V2 , and ∆V3 . Which of the following expresses the potential difference taken over the three resistors together?
∆Vt=∆V1+∆V2+∆V3
Three resistors connected in parallel have potential differences across them labeled ∆V1 , ∆V2 , and ∆V3 . Which of the following expresses the potential difference across all three resistors?
∆Vt=∆V1=∆V2 =∆V3