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Chapter 27: Q5Q (page 794)

For each circuit in Fig. 27-20, are the resistors connected in series, in parallel, or neither?

Short Answer

Expert verified

Fig 27.20aseries

Fig27.20bparallel

Fig27.20cparallel

Step by step solution

01

Given

02

Determining the concept

Observe the fig. carefully. If the resistances are one below the other, they are connected in parallel and if connected one after the other, they are in series.

03

Determining whether resistances are in series, parallel, or neither

Here, in fig 27.20a,resistances are connected in series because they are wired one after another in a chain.

Hence, Series arrangement is shown below.

Here, in fig27.20b,resistances are connected in parallel because they are not wired one after another in a chain.

Hence, parallel arrangement is shown below.

Here, in fig27.20c,resistances are connected in parallel because they are not wired one after another in a chain.

Hence, parallel arrangement is shown below.

Therefore, if resistances are connected in a chain, they are in series, and the ones, which are not, are in parallel.

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Most popular questions from this chapter

Question: An initially uncharged capacitor C is fully charged by a device of constant emf connected in series with a resistor. R (a) Show that the final energy stored in the capacitor is half the energy supplied by the emf εdevice. (b) By direct integration of i2Rover the charging time, show that the thermal energy dissipated by the resistor is also half the energy supplied by the emf device.

The starting motor of a car is turning too slowly, and the mechanic has to decide whether to replace the motor, the cable, or the battery. The car’s manual says that the12Vbattery should have no more than0.020Ω internal resistance; the motor should have no more than 0.200Ωresistance, and the cable no more than 0.040Ωresistance. The mechanic turns on the motor and measures 11.4Vacross the battery, a 3.0Vcross the cable, and a current of 50A. Which part is defective?

In Fig. 27-58, a voltmeter of resistance RV=300Ωand an ammeter of resistanceRA=3.00Ω are being used to measure a resistance R in a circuit that also contains a resistance R0=100Ωand an ideal battery with an emf of ε=12.0V. ResistanceR is given by R=V/i, whereV is the potential across Rand iis the ammeter reading. The voltmeter reading is V', which is V plus the potential difference across the ammeter. Thus, the ratio of the two-meter readings is not R but only an apparent resistance role="math" localid="1664348614854" R'=V/i. If R=85.0Ω, what are (a) the ammeter reading, (b) the voltmeter reading, and (c)R' ? (d) IfRA is decreased, does the difference betweenR' andR increase, decrease, or remain the same?

Question: In Fig. 27-14, assume that ε=3.0V,r=100Ω,R1=250ΩandR2=300Ω, . If the voltmeter resistance RV= 5. 0 KΩ, what percent error does it introduce into the measurement of the potential difference across R1 ? Ignore the presence of the ammeter.

After the switch in Fig. 27-15 is closed on point a, there is current ithrough resistance R. Figure 27-23 gives that current for four sets of values of Rand capacitance C: (1)R0andC0, (2)2R0andC0, (3)R0and2C0, (4)2R0and2C0. Which set goes with which curve?
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