Canadian Basic Qualification pool, section B-005-004

Subelement B-005

B-005

Section B-005-004

B-005-004-001

What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

A.
1.5 volts
B.
0.25 volts
C.
2.5 volts
Correct Answer
D.
1.0 volts

B-005-004-001

Ohm's Law ( I = E / R ) becomes E = R*I when solving for E. Voltage = resistance times current. Volts = ohms * amperes. 2 ohms * 0.5 amperes = 1.0 volts.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-004-002

How is the current in a DC circuit calculated when the voltage and resistance are known?

A.
Current equals resistance multiplied by voltage
B.
Current equals resistance divided by voltage
Correct Answer
C.
Current equals voltage divided by resistance
D.
Current equals power divided by voltage

B-005-004-002

Ohm's Law is I = E / R, current is voltage divided by resistance. Amperes = volts / ohms.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-004-003

How is the resistance in a DC circuit calculated when the voltage and current are known?

Correct Answer
A.
Resistance equals voltage divided by current
B.
Resistance equals current divided by voltage
C.
Resistance equals power divided by voltage
D.
Resistance equals current multiplied by voltage

B-005-004-003

Ohm's Law ( I = E / R ) becomes R = E / I when solving for R. Resistance is voltage divided by current. Ohms = volts / amperes.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-004

How is the voltage in a DC circuit calculated when the current and resistance are known?

A.
Voltage equals power divided by current
Correct Answer
B.
Voltage equals current multiplied by resistance
C.
Voltage equals resistance divided by current
D.
Voltage equals current divided by resistance

B-005-004-004

Ohm's Law ( I = E / R ) becomes E = R*I when solving for E. Voltage is resistance times current. Volts = ohms * amperes.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-005

What is the resistance of a circuit that draws 0.25 amperes from a 12-volt source?

A.
12 ohms
B.
3 ohms
C.
0.25 ohms
Correct Answer
D.
48 ohms

B-005-004-005

Ohm's Law ( I = E / R ) becomes R = E / I when solving for R. Resistance is voltage divided by current. Ohms = volts / amperes. 12 volts / 0.25 amperes = 48 ohms.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-006

What value of resistance is required to drop 9 volts with a current of 10 milliamperes?

A.
90 ohms
B.
9000 ohms
Correct Answer
C.
900 ohms
D.
9 ohms

B-005-004-006

Ohm's Law ( I = E / R ) becomes R = E / I when solving for R. Resistance is voltage divided by current. Ohms = volts / amperes. 100 volts / 0.0008 amperes = 125 000 ohms = 125 kilohms. [ Note that volts divided by milliamperes is kilohms ]

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-004-007

If the current flowing through a 50-ohm resistor is 0.44 amperes, what voltage would you measure across the resistor?

Correct Answer
A.
22 volts
B.
222 volts
C.
0.22 volts
D.
2.2 volts

B-005-004-007

Ohm's Law ( I = E / R ) becomes E = R*I when solving for E. Voltage is resistance times current. Volts = ohms * amperes. 50 ohms * 0.44 amperes = 22 volts.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-008

A 30-ohm resistor is connected across a 6-volt battery. What current does it draw?

A.
2 amperes
B.
0.5 amperes
C.
0.005 amperes
Correct Answer
D.
0.2 amperes

B-005-004-008

Ohm's Law ( I = E / R ). Current is voltage divided by resistance. Amperes = volts / ohms. 6 volts / 30 ohms = 0.2 amperes.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-009

What voltage is needed to supply a current of 200 milliamperes to operate a relay that has a resistance of 25 ohms?

A.
8 volts
B.
50 volts
C.
0.5 volts
Correct Answer
D.
5 volts

B-005-004-009

Ohm's Law ( I = E / R ) becomes E = R*I when solving for E. Voltage is resistance times current. Volts = ohms * amperes. 25 ohms * 0.200 amperes = 5 volts.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-010

What formula calculates the resistance of a circuit when the voltage and current are known?

Correct Answer
A.
R = E / I
B.
R = E x I
C.
R = E squared / I
D.
R = I / E

B-005-004-010

Ohm's Law ( I = E / R ) becomes R = E / I when solving for R. Resistance is voltage divided by current. Ohms = volts / amperes.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-004-011

What is the resistance of a circuit if it draws 300 milliamperes from a 3-volt battery?

Correct Answer
A.
10 ohms
B.
5 ohms
C.
3 ohms
D.
9 ohms

B-005-004-011

Ohm's Law ( I = E / R ) becomes R = E / I when solving for R. Resistance is voltage divided by current. Ohms = volts / amperes. 3 volts / 0.300 amperes = 10 ohms.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

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