Lesson 7: Electrical Units I
One volt of current flows through a wire when one coulomb flows past a point in one second. Select one: True or False
False
The total amount of heat produced in a conductor is inversely proportional to the resistance times the square of the current. Select one: True or False
False
Voltage can flow through a wire or other conductor. Select one: True or False
False
A voltage or potential is present at a common wall outlet, but there is no current flow until some device (load resistance) is connected and a complete circuit exists. Select one: True or False
True
In the DC Theory textbook, the name of the type of current flow that will be used is called electron current flow. Select one: True or False
True
The symbol Ω is used to represent the ohm. Select one: True or False
True
Two factors that affect the speed of current flow are the type of material and the voltage. Select one: True or False
True
Voltage is defined as electromotive force or EMF. Select one: True or False
True
For current flow to occur, there must be __________ . a. a complete path b. a transformer c. an AC source d. measurable wattage
a. a complete path
The ___________ is the unit of electrical current flow. a. ampere b. ohm c. volt d. watt
a. ampere
One ____________ is equal to 6.25 x 1018, or 6,250,000,000,000,000,000 electrons. a. coulomb b. henry c. joule d. volt
a. coulomb
Current flowing through a resistance produces __________ . a. heat b. inductance c. ohms d. voltage
a. heat
One horsepower equals _________________ . a. 598 W b. 746 W c. 1,000 W d. 1,414 W
b. 746 W
In Ohm's law calculations, voltage is indicated by the letter __________. a. A b. E c. O d. V
b. E
The flow of electrons through a material is called _______________ . a. coulomb flow b. current c. electricity d. resistance
b. current
The opposition to current flow through a material is called _________________. a. amperage b. resistance c. voltage d. wattage
b. resistance
The letter ________ is used in Ohm's law calculations to represent the current. a. A b. O c. I d. W
c. I
A volt is the amount of potential necessary to cause one coulomb to produce one ____________ of work. a. ampere b. farad c. joule d. watt
c. joule
When a voltage is applied to a circuit and current flows through the load, ___________ is consumed. a. inductive reactance b. magnetomotive force c. power d. resistance
c. power
Power is directly related to the amount of _____________ and the amount of current flow. a. inductance b. resistance c. voltage d. wattage
c. voltage
A circuit that has a break in it preventing the flow of current is called a(n) ____________ circuit. a. closed b. faulted c. grounded d. open
d. open
In a __________ circuit, the current does not flow through the resistance of the full circuit. a. closed b. loop c. series d. short
d. short
The type of circuit that would have the highest or maximum current flow is a(n) __________ circuit. a. closed b. open c. series d. short
d. short
The maximum possible speed at which current can travel is ____________ . a. 18,600 miles per second b. 185,000 meters per second c. faster than the speed of light d. the speed of light
d. the speed of light
The ___________ is the unit of electrical power. a. ampere b. ohm c. volt d. watt
d. watt