Parallel Circuit Ch 13

Question 3 In a three-resistor parallel circuit, R1 = 0.22 MΩ and R2 = 1 MΩ. If RT = 0.1166 MΩ, then what is the value of R3?

0.33 M Ω*

Question 39 Refer to Figure 5-1. What is the power dissipation of R3?

284.09 mW

Question 8 If four 100 W lamps are connected in parallel across a 120 V source, what is the total current?

3.33 A

Question 19 Each branch in a four-branch parallel circuit carries 10 mA. If one of the branches opens, then the current in each of the other three branches equals __________.

30 mA

Question 11 The current through any branch of a parallel circuit __________.

is inversely proportional to the branch resistance

Question 2 If a 2.2 kΩ resistor and a 3.3 kΩ resistor are connected in parallel, RT equals __________.

less than 2.2 kΩ

Question 4 If twelve 1.5 MΩ resistors are connected in parallel across 50 V, RT equals __________.

0.125 MΩ*

Question 25 A three-branch parallel circuit carries a total current of 1.2 mA. If I1 = 0.2 mA and I2 = 0.7 mA, then what is the value of I3?

0.3 mA

Question 6 If one resistor opens in a parallel circuit, the total circuit resistance __________ and the total circuit current __________.

increases, decreases

Question 38 Refer to Figure 5-1. The fuse in this circuit is rated at 100 mA. Would the fuse blow if an additional 1 kΩ were placed in parallel with R5?

no

Question 26 If one resistor opens in a parallel circuit, the total current __________.

Decreases

Question 10 A formula that applies to a two-branch parallel circuit is __________.

IT = IR1 + IR2*

Question 32 As resistors are disconnected from a parallel circuit, __________.

IT decreases and RT increases

Question 14 As additional branch resistors are connected in a parallel circuit, __________.

IT increases and RT decreases

Question 9 If you measure a lower than normal total current in a parallel circuit, __________.

a resistor opened

Question 35 An open in one branch of a parallel circuit results in:

all of these. decreased power consumption increased circuit resistance decreased or reduced current flow

Question 33 The most popular application for a parallel circuit in electronics is as a:

current divider.

Question 28 The power dissipated by any branch of a parallel circuit __________.

depends on the voltage and value of the resistor

Question 12 If you want to measure a load voltage with a DVM, connect the meter __________.

in parallel with the load

Question 30 To measure the current through one branch of a parallel circuit, the meter is connected __________.

in series with the branch resistor

Question 7 If one resistor shorts in a parallel circuit, the total current __________.

increases

Question 5 IT equals 0.1 mA in a 3-branch parallel circuit. If I1 = 0.022 mA and I2 = 0.007 mA, I3 = ?

0.071 mA

Question 23 A 5.2 MΩ resistor, 1.2 MΩ resistor and 1 MΩ resistor are connected in parallel across a 15 V source. What is the total current if the 1.2 MΩ resistor opens?

17.88 μA

Question 1 If a 500 Ω, 1200 Ω and 10 kΩ resistor are connected in parallel across a 25 V source, how much current flows through the 1200 Ω resistor?

20.83 mA

Question 22 If a 470 Ω resistor, 680 Ω resistor and 830 Ω resistor are connected in parallel, the total resistance equals __________.

208 Ω

Question 31 If the RT = 6.8 kΩ and R1 = 10 kΩ in a two-branch parallel circuit, what is the value of R2?

21.25 kΩ

Question 20 If the power dissipation in each of four parallel branches is 1 W, PT equals __________.

4 W

Question 15 If a 4.7 kΩ resistor, a 3.3 kΩ resistor and a 5.43 kΩ resistor are connected in parallel across a 50 V source, what is the current through the 5.43 kΩ resistor?

9.21 mA

Question 27 If three 75 W lamps are connected in parallel across a 125 V source, IT equals __________.

1.8 A

Question 13 The total resistance of a three-branch parallel circuit is 76.92 Ω. If R1 = 100 Ω and R2 = 500 Ω, what is the value of R3?

1000 Ω

Question 16 RT = 330 Ω and R1 = 470 Ω in a two-branch parallel circuit. What is the value of R2?

1108 Ω

Question 17 If a 330 Ω resistor, 270 Ω resistor and 68 Ω resistor are connected in parallel, what is the approximate value for RT?

47 Ω

Question 24 If eight 47 kΩ resistors are connected in parallel across a 25 V source, RT equals __________.

5.875 kΩ

Question 21 If a 2.2 kΩ resistor, 10 kΩ resistor and 1.2 kΩ resistor are connected in parallel, the total resistance equals __________.

721 Ω

Question 18 If 5 A and 3 A enter a junction from two separate paths, how much current flows out of the junction?

8 A

Question 36 Refer to Figure 5-1. The voltage across R2 is 0 V. What is most likely the problem?

Fuse open

Question 37 Refer to Figure 5-1. To accurately measure the total current for this circuit, how must the ammeter be connected?

right either A or C A: between the negative terminal and the supply and ground C: between the positive terminal and the fuss

Question 29 If the total current equals 0 A in a four-branch parallel circuit, the trouble is that __________.

the power supply is off

Question 34 In a parallel circuit, the largest amount of power is dissipated by:

the smallest resistor.