Deck 3: Ohms Law

Question 1

Given the circuit in Figure , what is the value of the resistor?

A) 4.78 kΩ
B) 121 Ω
C) 2.69 kΩ
D) 2.69 Ω

Answer 1

2.69 kΩ

Question 2

Increasing voltage while maintaining the same resistance will cause current to decrease.

Answer 2

False

Question 3

Given the circuit in Figure 3-1, how many amps of current flow through the circuit?

A) 8.2 A
B) 1.0 A
C) 0.82 A
D) 1.22 A

Answer 3

1.22 A

Question 4

Figure 3-3
Given the circuit in Figure 3-3, how much current flows through the circuit?

A) 3.84 µA
B) 3.84 mA
C) 0.26 mA
D) 3.84 A

Question 5

If the voltage across a resistor has tripled, the current will:

A) stay the same
B) triple
C) decrease
D) double

Question 6

Figure 3-7
Given the circuit in Figure 3-7, what is the battery voltage?

A) 110 V
B) 110 µV
C) 22.7 V
D) 110 mV

Question 7

A mathematical relationship between current, voltage, and resistance was determined by George Ohm?

Question 8

Figure 3-4
To obtain voltage in volts, you must express the value of I in _ _ and the value of R in .

A) Milliamperes, Ohms
B) Amperes, Ohms
C) Milliamperes, Megohms
D) Amperes, Kilo-Ohms

Question 9

Figure 3-8
To obtain the resistance in Ohms, you must express the value of I in _ _ and the value of V in .

A) Amperes, Millivolts
B) Amperes, Volts
C) Milliamperes, Volts
D) Microamperes, Millivolts

Question 10

Figure 3-4
Given the circuit in Figure 3-4, how much current flows through the circuit?

A) 0.67 mA
B) 1.5 A
C) 1.5 mA
D) 0.69 A

Question 11

Given the circuit in Figure , what resistance is required to draw the specified current?

A) 11.4 Ω
B) 5.7 kΩ
C) 5.7 Ω
D) 25.2 Ω

Question 12

Given the circuit in Figure , what is the value of the resistor?

A) 1 MΩ
B) 100 kΩ
C) 1 Ω
D) 1 kΩ

Question 13

Figure 3-6
Given the circuit in Figure 3-6, What is the voltage across the resistor?

A) 50 mV
B) 50 V
C) 2.0 mV
D) 2.0 V

Question 14

Figure 3-8
Given the circuit in Figure 3-8, what is the voltage across the resistor?

A) 15.5 V
B) 1.42 V
C) 51.2 V
D) 15.5 mV

Question 15

Given the circuit in Figure , what is the value of the resistor?

A) 125 Ω
B) 8 MΩ
C) 800 kΩ
D) 125 kΩ

Question 16

Figure 3-5
Given the circuit in Figure 3-5, What voltage is required to produce a current of 2.0 Amps?

A) 5.0 V
B) 50 V
C) 12.5 V
D) 1.25 V

Question 17

A change in voltage will result in a linearly proportional change in current.

Question 18

The voltage across a circuit resistance is inversely related to the current through that resistance.

Question 19

Figure 3-2
Given the circuit in Figure 3-2, how much current is flowing through the circuit?

A) 3.84 A
B) 0.26 mA
C) 3.84 µA
D) 3.84 mA

Question 20

A short could best be described as a unintended path for voltage.

Question 21

Given the circuit in Figure what is the value of the resistor?

A) 120 Ω
B) 12 kΩ
C) 120 kΩ
D) 12 Ω

Question 22

Which of the following is a form of Ohm's Law?

A) $V=\frac{R}{I}$

B) $I=\frac{R}{V}$

C) $\mathrm{I}=\mathrm{V} \times \mathrm{R}$

D) $R=\frac{V}{I}$

Question 23

A certain resistor has a color code of Red/Red/Red/Gold). If this resistor were connected across the terminals of a 12 volt car battery, what nominal current would flow through the resistor?

A) 5.45 mA
B) 5.74 mA
C) 6.0 mA
D) 5.19 mA

Question 24

How many ohms of resistance allows a current of 720 µA to flow, when 3.6 kV is applied?

A) 5 MΩ
B) 200 kΩ
C) 5 kΩ
D) 200 nΩ

Question 25

How much voltage is needed to produce a current of 5 A when total opposition is 50 Ω?

A) 2.5 kV
B) 250 V
C) 25 V
D) 2.5 V

Question 26

When circuit voltage increases and resistance decreases at the same rate, current will:

A) double
B) increase
C) decrease by half
D) not enough information

Question 27

The current through a 10 kΩ resistor is 14 µA. What is the voltage drop across the resistor?

A) 14 mV
B) 14 V
C) 140 mV
D) 1.4 V

Question 28

How much current flows when a 15 ohm resistor is connected across a 5 V source?

A) 3.3 A
B) 3.0 A
C) 0.33 A
D) 0.5 A

Question 29

If V = 50 V and R = 100 kΩ the current equals .

A) 500 µA
B) 50 mA
C) 0.5 mA
D) both A and C

Question 30

What electromotive force would cause 20 A of current to flow through a 500 ohm resistor?

A) 10 kV
B) 2.5 V
C) 1 kV
D) 25 V

Question 31

Given the circuit in Figure what resistance is required to draw the specified current?

A) 12 kΩ
B) 120 Ω
C) 120 kΩ
D) 11.2 kΩ

Question 32

If a variable voltage source is set to 12 volts. To what voltage must it be adjusted to decrease the circuit current by 25%?

A) Increase it to 16 volts
B) Decrease it to 9 volts.
C) Increase it to 20 volts
D) Decrease it to 6 volts.

Question 33

If the voltage in a circuit has doubled, the current will:

A) decrease
B) stay the same
C) triple
D) double

Question 34

A battery applies 45 volts to a circuit, while an ammeter reads 10 mA. Later, the ammeter reading drops to 7 mA. Assuming the resistance has not changed, the voltage must have:

A) increased to 58.5 volts
B) decreased to 31.5 volts
C) decreased 30% from its old value
D) both B and C are correct
E) stayed the same

Question 35

You found a real bargain on a dashboard fan at a flea market. When you got home, you discovered it was a 6 volt fan that would draw 500 mA at 6 V. Your car has a 12 V system. You need a resistor that will drop 6 V at 500 mA. What value resistor do you need?

A) 18 Ω
B) 12 Ω
C) 6.0 Ω
D) 6.2 Ω

Question 36

How many amperes will flow in a circuit that contains a 110 V source and 20 kΩ of resistance?

A) 5.5 A
B) M55 mA
C) 55 mA
D) 5.5 mA

Question 37

If an ammeter in a circuit is reading 20 mA and the applied voltage is 25 V, what would the value of the load resistor be?

A) 12.5 kΩ
B) 125 Ω
C) 12.5 Ω
D) 1.25 kΩ

Question 38

Figure 3-15
Given the circuit in Figure 3-15, what is the circuit current?

A) 0.001 A
B) 0.00001 A
C) 0.01 A
D) 0.0001 A

Question 39

$6$
Figure 3-16

-Given the circuit in Figure 3-16, what is the circuit current?

A) 10 µA
B) 1 µA
C) 1 mA
D) 100 µA

Question 40

How is Ohm's law expressed in words?

A) The current is linearly proportional to the voltage and inversely proportional to the resistance.
B) The voltage is linearly proportional to the current and inversely proportional to the resistance.
C) The voltage is linearly proportional to the resistance and inversely proportional to the current.
D) The current is linearly proportional to the resistance and inversely proportional to the voltage.

Question 41

If the resistor's voltage is 3 V, with 100 mA flowing through it, what is the resistors value?

A) 0.3 Ω
B) 0.03 Ω
C) 3.0 Ω
D) 30 Ω

Question 42

What EMF would cause 20 A of current to flow through a 500 Ω resistor?

A) 1 kV
B) 0.04 V
C) 10 kV
D) 2.5 V

Question 43

Voltage and current are:

A) quantities that subtract
B) inversely proportional
C) directly proportional
D) ideally the same value

Question 44

$8$


-If an electric circuit draws 1 A at 50 V, how much current will it draw if the voltage is increased to 75 V?

A) M15 V
B) 15 µA
C) 15 mA
D) 1.5 A