Parallel Circuits

Parallel circuits----------General questions-----------1.When parallel resistors are of three different values, which has the greatest power loss?

A.The smallest resistance

B.The largest resistance

C.They have the same power loss.

D.Voltage and resistance values are needed.

Answer & ExplanationAnswer: Option A

2.What is the product-over-sum result of 150 and 6800?

A.150B.146.7

C.0.006D.6800

Answer & ExplanationAnswer: Option B

3.The voltage across any branch of a parallel circuit:

A.varies as the total current varies

B.is inversely proportional to total circuit resistance

C.is equally applied to all branch conductances

D.is dropped in proportion to each branch resistance

Answer & ExplanationAnswer: Option C

4.What is the total power loss if 2 k and 1 k parallel-connected resistors have an IT of 3 mA?

A.6 WB.36 W

C.6 mWD.36 mW


5.What happens to total resistance in a circuit with parallel resistors if one of them opens?

A.It increases.B.It halves.

C.It remains the same.D.It decreases.


6.Components that connect in parallel form:

A.branchesB.open circuits

C.short circuitsD.a voltage divider


7.A parallel circuit differs from a series circuit in that a parallel circuit has

A.no path for current flow

B.fewer paths for current flow

C.one path for current flow

D.more than one path for current flow

Answer & ExplanationAnswer: Option D

8.In the given circuit, Channel 1 of the stereo amplifier outputs 12 V to the speakers. How much total current is the amplifier providing to the speakers?

A.0 A

B.1.5 A

C.3 A

D.More information is needed to find the total current provided to the speakers.


9.If two parallel-connected resistors dissipate 6 watts and 10 watts of power, then what is the total power loss?

A.3.75 wattsB.4 watts

C.16 wattsD.60 watts


10.Which component is shorted?

A.R1B.R2

C.R3D.R4


11.What would these meter readings indicate about the circuit in the given circuit?Meter Readings: I = 7.6 mA, V = 12 V

A.R1 is open.

B.R2 is open.

C.The fuse is open.

D.The circuit is operating normally.


12.In the given circuit, Channel 1 of the stereo amplifier outputs 12 V to the speakers. How much total power is the amplifier delivering to the speakers?

A.0 W

B.18 W

C.36 W

D.More information is needed to find the total power delivered to the speakers.


13.If a 1 k and a 2 k resistor are parallel-connected across a 12 V supply, how much current is received by the 2 k resistor?

A.4 mAB.6 mA

C.8 mAD.12 mA


14.What does VS equal in the given circuit?

A.0 V

B.9 V

C.27 V

D.More information is needed to find VS.


15.The current through R1 will be:

A.128 mAB.88 mA

C.48 mAD.2.2 mA


16.The voltage read by the voltmeter will be:

A.24 VB.12 V

C.6 VD.4 V


17.Which component is of the wrong value?

A.R1B.R2

C.R3D.R4


18.What does I3 equal in the given circuit?

A.5 mAB.45 mA

C.50 mAD.100 mA


19.What is the total power of the circuit?

A.2.2 WB.4.2 W

C.6.2 WD.8.2 W


20.What are the individual values of two parallel resistors whose RT is 8 ohms, when one has double the resistance of the other?

A.2.7 ohms and 5.3 ohms

B.8 ohms and 16 ohms

C.10 ohms and 20 ohms

D.12 ohms and 24 ohms


21.When a parallel 5 k resistor and a 25 k resistor have a 10 V supply, what is the total power loss?

A.2.4 mWB.3.3 mW

C.24 mWD.33 mW


22.In a parallel resistive circuit:

A.there is more than one current path between two points

B.the voltage applied divides between the branches

C.the total branch power exceeds the source power

D.the total circuit conductance is less than the smallest branch conductance


23.What is the total resistance?

A.7 kB.1 k

C.706 D.353


24.Kirchhoff's current law for parallel circuits states that the:

A.sum of all branch voltages equals zero

B.total circuit resistance is less than the smallest branch resistor

C.sum of currents into a junction is equal to the difference of all the branch currents

D.sum of the total currents flowing out of a junction equals the sum of the total currents flowing into that junction


25.Which component is open?

A.R1B.R2

C.R3D.R4


26.What would these meter readings indicate about the circuit in the given circuit?Meter Readings: I = 0 mA, V = 0 V

A.R1 is open.

B.R2 is open.

C.The fuse is open.



27.If 550 mA of current leaves a node that had 250 mA entering from one branch, how much current would enter from the other?

A.250 mAB.300 mA

C.550 mAD.800 mA


28.What would these meter readings indicate about the circuit in the given circuit?Meter Readings: I = 10 mA, V = 12 V

A.R1 is open.

B.R2 is open.

C.The fuse is open.



29.What does RT equal in the given circuit?

A.90 B.180

C.200 D.1.8 k


30.What procedure should be followed when troubleshooting with an ammeter or voltmeter?

A.Short the leads and adjust.

B.Check the meters external power supply.

C.Start with the highest scale and adjust down to a lower scale.

D.Start with the lowest scale and adjust up to a higher scale.


31.A parallel circuit is also used as a divider for:

A.conductanceB.voltage

C.powerD.current


32.What is RT for a 12 k, a 4 k, and a 3 k resistor in parallel?

A.1.5 kB.2 k

C.6.3 kD.19 k


33.What is the total resistance of four 1 k parallel-connected resistors?

A.200 ohmsB.250 ohms

C.400 ohmsD.4 kilohms


34.Which are the better test devices used to isolate a suspected open component within a parallel circuit?

A.a voltmeter or an ohmmeter

B.neither an ammeter nor a voltmeter

C.a wattmeter or a voltmeter

D.an ammeter or an ohmmeter


35.What does P2 equal in the given circuit?

A.45 mWB.405 mW

C.450 mWD.900 mW


36.What does R1 equal in the given circuit?

A.90

B.180

C.200

D.1.8 k


37.

37.What is the total resistance?

A.1.045 kB.1.545 k

C.2.045 kD.2.545 k


38.What is RT for fifteen 2 M resistors all connected in parallel?

A.133 kB.300 k

C.750 kD.30 M


39.Which is considered to be the common reference for a parallel circuit?

A.VoltageB.Current

C.PowerD.Resistance


True and false1.The total resistance in a parallel circuit is always less than the least resistor.

A.TrueB.False


2.If a branch opens in a parallel circuit, the current in the remaining parallel paths will change.

A.TrueB.False


2.

3.If a branch opens in a parallel circuit, the total circuit resistance decreases.

A.TrueB.False


4.The largest branch resistance in a parallel circuit carries the largest branch current.

A.TrueB.False


5.If two equal resistors are connected in parallel, they will carry identical currents.

A.TrueB.False


6.Kirchhoff's current law states that the current flowing into a point of a circuit is equal to the sum of the voltages in the output branches.

A.TrueB.False


.The voltages across all components in parallel are equal.

A.TrueB.False


8.The total resistance in a parallel circuit is always greater than the lowest-value branch resistor.

A.TrueB.False


9.A parallel circuit is sometimes called a current divider.

A.TrueB.False


10.The total resistance of a parallel circuit is always greater than the largest resistor value.

A.TrueB.False


11.The voltage in a parallel circuit is the same across each branch of the circuit.

A.TrueB.False


12.The total power dissipated is 4.8 watts.

A.TrueB.False


13.If one branch shorts out in a parallel circuit, the other branches are not affected.

A.TrueB.False


14.If one of the resistors opens in a parallel circuit branch, the total resistance of the circuit will decrease.

A.TrueB.False


15.The total current entering a junction may be different from the total current leaving the junction.

A.TrueB.False


16.The total resistance is 480 .

A.TrueB.False


17.The total power in a parallel circuit equals the sum of the individual branch powers.

A.TrueB.False


18.Current divider predicts that the most current will flow in the parallel path of the most resistance.

A.TrueB.False


19.The total resistance of like value resistors in parallel is equal to the value of the resistors multiplied by the number of resistors used.

A.TrueB.False


20.Parallel circuits have only one path for current.

A.TrueB.False


Parallel Circuits

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