Transcript Self Quiz Chapters 3 & 4

Review #2: Chapters 3 and 4
1. Which characteristic of electromagnetic (EM)
energy is common to all energies in the spectrum?
Wavelength, frequency, amplitude, or velocity.
10. Using Ohm’s law, when there are 9 V and 3 ohms
what is the amperage?
2. Describe an electromagnet. How does it differ from
a solenoid?
11. Is it voltage, amperage or resistance that causes
a spark to jump a gap?
3. What is impedance?
12. P=I V What is this the formula for? What is the
unit of measurement?
4. What is an atomic mass unit based on?
13. What is thermionic emission?
5. Does an electron have mass?
6. When describing characteristics of photon energy
with a sine wave, what factors are inversely
proportional to each other?
7. What is the difference between periods and groups
on the periodic table?
14 A motor converts what kind of energy to what
kind of energy?
15. What is the purpose of a rectifier circuit in the
circuitry of the x-ray tube.
16 At what angles of the sine wave is the signal at
zero, max, zero, max, and zero again?
8. How many electrons can potentially fill all of the
orbital shells if the outermost shell is 3 (or m)
17. What is the purpose of an electrical transformer?
9. Potassium has an atomic number of 19. How many
electrons will it have in its outermost shell?
18. What do we know about a transformer with 1000
windings in the primary and 500 winding in the
secondary?
19. Current in an x-ray tube flows through two electrodes,
the negative _______ and the positive _____.
Review #2: Chapters 3 and 4
1. Which characteristic of electromagnetic (EM)
energy is common to all energies in the spectrum?
Wavelength, frequency, amplitude, or velocity.
Velocity
2. Describe an electromagnet. How does it differ from
a solenoid? A solinoid is a coil with a current
passing through it. Add an iron core and it’s an
electromagnet.
3. What is impedance? resistance
10. Using Ohm’s law, when there are 9 V and 3 ohms
what is the amperage? Ohm’s law: V=IR, or in
this case I=V/R or 9/3 = 3 amps.
11. Is it voltage, amperage or resistance that causes
a spark to jump a gap? Voltage (potential difference)
12. P=I V What is this the formula for? What is the
unit of measurement? Electrical power, measured
in watts, or kilowatts.
4. What is an atomic mass unit based on? 1/12 the
atomic mass of a carbon 12 atom
13. What is thermionic emission? The process of
adding energy to atoms in a filament, lowering
their binding energy and creating a space charge
5. Does an electron have mass? Yes, though very
little (.000548 AMU)
14 A motor converts what kind of energy to what
kind of energy? electrical to mechanical
6. When describing characteristics of photon energy
with a sine wave, what factors are inversely
proportional to each other? Frequency and
wavelength
15. What is the purpose of a rectifier circuit in the
circuitry of the x-ray tube. To change AC to DC
7. What is the difference between periods and groups
on the periodic table? Periods are atoms with the
same outermost principle number shell, groups
are atoms with the same valence number of
electrons.
8. How many electrons can potentially fill all of the
orbital shells if the outermost shell is 3 (or m)
2 + 8 + 18 = 28
9. Potassium has an atomic number of 19. How many
electrons will it have in its outermost shell? One.
Two in 1st shell, 8 in second shell, 8 in the
third shell (octet rule) and one in the 4th shell.
16 At what angles of the sine wave is the signal at
zero, max, zero, max, and zero again?
0, 90, 180, 270, 360 degrees
17. What is the purpose of an electrical transformer?
Raise V lower A (step up). Or lower V and raise A
18. What do we know about a transformer with 1000
windings in the primary and 500 winding in the
secondary? It’s a step down transformer with a
2:1 ratio. Voltage and amperage will be inversely
transformed by a factor of 2.
19. Current in an x-ray tube flows through two electrodes,
the negative cathode and the positive anode.