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Name __________________
ECH 3702 Jan 31. 2008
test #1
Next test is Wed March 5 2008
1. When is the next test? __________________(only turn in this test paper- other stuff will be lost)
2. As the distance between two objects increases the force between
them is directly proportional to the change in that distance.
yes___
no____
3. Electrostatic force is directly proportional to the mass of the
two objects.
yes___
no____
4. Electrons have minimal mass and are affected by a gravitational
force field.
yes___
no____
5. A mole of electrons generates a Coulomb of negative charge.
yes___
no____
23
6. 6.02 x 10 is a Faraday of charge.
yes___
no____
7. The universal field constant for electrostatic charge is 9 x 109 Newton. yes___
no____
8. The units for electrostatic field strength are Newton/volt.
yes___
no____
9. Electrons have very little mass and are predominately affected by
the electrostatic force field.
yes___
no____
10. A joule per volt is also a Coulomb per second
yes___
no____
11. Pound is to slug as Newton is to ____________
12. How much work can 1 Coulomb of charge that moves 1 meter
toward the positive reference charge in a 2 volt per meter electric field do? __________
13. If 2 amperes of current flow how many Coulombs have been
moved in 1/2 seconds?
__________
14. If there is 24 volt drop across a 15 ohm and a 30 ohm resistor connected
in series, what is the voltage value after the
15 ohm resistor but before the 30 ohm resistor?
__________
15. If the position of the resistor in question 14 is reversed, what is the voltage
value below the 30 ohm resistor but above the 15 ohm resistor?
__________
16. Oxidation occurs at the cathode.
yes___
no____
17. In a battery the source of the electrons is the + terminal.
yes___
no____
18. Current divide circuits are also series circuits.
yes___
no____
19. The flow of electrons on a wire is measured in volts.
yes___
no____
20. The units of capacitance are volts per Coulombs.
yes___
no____
21. Draw an icon that represents a.
Normally Open push button.
22. Draw an icon that represents a
Normally Closed push button.
23. Draw a 24 volt circuit that shows
a normally open push button in
series with a 30 ohm resistor.
24. Draw a 24V circuit with a N.C. button that,
when depressed, will make an store energy.
25. If a 5 ohm resistor is in series with a parallel circuit
that contains a 5 ohm capacitor and a 5 ohm inductor,
(a) What is the total is the impedance for this
entire circuit? _______
(b) What is the current flow through the resistor?_________
-1
F2 + 2e
2F
-
+ 2.85 V
+2
-1
Hg
0
+ 0.85 V
+2
-1
Cu
0
+ 0.34 V
+2
-1
Zn
0
- 0.76 V
+1
-1
Na
0
- 2.71 V
Hg + 2e
Cu + 2e
Zn + 2e
Na + 1e
26) Consider the information about the” Daniell” cell provided above:
(a) Label the anode and cathode
(b) circle a cation
(c) Put a triangle around an anion
(d) Label each electrode with the material it is made of.
(e) For this battery write the
(1) half-reaction that occurs at the cathode.
(2) half-reaction that occurs at the anode
(f) What it the nominal voltage rating for this battery?
26)
27)
28)
29)
30)
_________
(g) Which terminal (+ or -) is the source for electrons?
_________
The Farad is the unit of inductance.
yes___
1 Farad is also 1 Coulomb/Volt .
yes___
1 Henry is 1 Volt-sec/ampere
yes___
If a 5 Farad circuit element has 20 Coulombs of charge it has
a 1 volt drop across its terminals.
yes___
If the current in a 5 Henry circuit device
is changing at a rate of 2 amperes per
second, what is the voltage across the
terminals of this device?
_________
no____
no____
no____
no____