Elenco Electronic Component Kit - Manual (Page 17)

-16-
SELF TEST
1. The inductor is best described as:
a) Induced Voltage c) Electrical Storage Device
b) Long Wire d) Electrical Momentum
2. When wires in a coil are moved closer together, the
inductance will:
a) Increase c) Stay the Same
b) Decrease
3. Another word used to represent an inductor:
a) Wire c) Transformer
b) Coil d) Conductor
4. If the diameter of a coil is increased, the inductance
will:
a) Increase c) Stay the Same
b) Decrease
5. If the number of turns in a coil is decreased, the
inductance of that coil will:
a) Increase c) Stay the Same
b) Decrease
6. An inductor will block:
a) Alternating Voltage c) Alternating Current
b) Direct Voltage d) Direct Current
7. When an iron core is placed into the center of a coil,
the inductance will:
a) Increase c) Stay the Same
b) Decrease
8. If voltage in a transformer is stepped down, the current
will:
a) Increase c) Must Stay the Same
b) Decrease
9. When a conductor is moved through a magnetic field:
a) Power is created c) Magnetic field is
reduced
b) A voltage is d) a & c
generated on the wire.
10. The Q factor of a coil is equal to:
a) Wire quality c) Ratio of inductance
b) Ratio of reactance to resistance
to resistance
11. If windings on a straight rod are in the same direction,
the induced voltage will have:
a) Same amplitude c) Same polarity
b) Different amplitude d) Different polarity
12. An inductor stores energy in its:
a) Electric field c) Core
b) Magnetic field d) Wires
THEORY
Circle the letter that best fits the description.
PRACTICE
Using the coil supplied, answer the following questions.
EXTRA CREDIT
What happens to the total inductance if you connect two
coils as shown in Figure 25. Hint, remember the coiled
hose analogy and try to calculate equivalent if one coiled
hose.
Figure 25
10
μH
?
μH
INDUCTORS
(Hold the leads and peel the tape off).
Is the coil wound on an iron form? Yes ____ No ____
What prevents the wire from shorting? ________________________________________
How many turns are on the coil? _____________________
Example: Using a length of 0.1”, a radius of 0.02”, permeability of 14 for the iron core, and 56 turns, calculate
the inductance of the coil and record here: ________________________
20
μH