Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
Inductance is a characteristic of an electrical conductor that ________ change in current.
a. Aids b. Opposes c. Multiplies d. Subrtracts |
b. Opposes
|
|
|
What is the basic unit of inductance and its abbreviated form?
a. Ohms (Ω) b. Induction (L) c. Henry (H) d. Omicron(ω) |
c. Henry (H)
|
|
|
What is the unit of measurement of inductance?
a. L b. M c. R d. H |
a. L
|
|
|
True Or False: One henry is equal to the inductance required to induce one volt in an inductor by a change of current of one
ampere per second. |
TRUE!
|
|
|
It requires _______ energy to start or stop current than it
does to keep it flowing. a. Exponential b. Less c. No more d. More |
d. More
|
|
|
When a magnetic field moves through a stationary metallic conductor, electrons ___________________________ .
a. are dislodged from their orbits b. are forced to change direction c. are not effected d. remain stationary |
a. are dislodged from their orbits
|
|
|
The electrons move in a direction determined by the movement of ___________________.
a. current b. voltage c. the conductor d. the magnetic lines of flux |
d. the magnetic lines of flux
|
|
|
The difference between the charges in the conductor is equal to a difference of potential (or voltage).
This voltage caused by the moving magnetic field is called _________ . a. static electricity b. electromotive force c. potential energy d. power |
b. electromotive force (emf)
|
|
|
An emf is generated in a conductor when the conductor is cut by what type of field?
a. E Field b. H Field c. Magnetic Field d. Static Field |
c. Magnetic Field
|
|
|
Lenz's law which states
that: THE INDUCED EMF IN ANY CIRCUIT IS ______ IN A DIRECTION TO ______ THE EFFECT THAT PRODUCED IT. a. NEVER OPPOSE b. ALWAYS INCREASE c. ALWAYS OPPOSE d. ALWAYS POSITIVELY |
c. ALWAYS OPPOSE
|
|
|
The left hand rule of generators states that the thumb points in the direction of what?
a. relative motion of conductor b. magnetic field c. induced current d. electron flow |
a. relative motion of conductor
|
|
|
The left hand rule of generators states that the middle finger points in the direction of what?
a. relative motion of conductor b. magnetic field c. induced current d. electron flow |
c. induced current
|
|
|
The left hand rule of generators states that the index finger points in the direction of what?
a. relative motion of conductor b. magnetic field c. induced current d. electron flow |
b. magnetic field
|
|
|
TRUE OR FALSE: Induced emf is the emf which appears across a conductor when there is relative motion between
the conductor and a magnetic field. |
TRUE
|
|
|
TRUE OR FALSE: Counter emf is the emf induced in a conductor that opposes
the applied current. |
FALSE:
counter emf is the emf induced in a conductor that opposes the applied VOLTAGE. |
|
|
How are conductors classified by?
a. coil size b. current rating c. core type d. power type |
c. core type
|
|
|
The core material of an inductor is normally how many basic type(s)?
a. 1 b. 2 c. 3 d. 4 |
b. 2
soft-iron or air |
