Exam 1 Review
EE301
Exam 1 Review
05FEB14
1) If 85 Joules of Energy is required to move 368 Coulombs of charge, what is the Voltage Potential
created?
2) Through a given surface of a conductor cross section area, 15 mA of current passes at a rate of
200 µs. What is the amount of charge?
3)
A 6 V battery has a rating of 52 A-h. What is the average amount of current if the battery is
drained after operating for 145.8 minutes?
4) What is the Voltage across a 220 Ω resistor if 15 mA passes through it?
15 mA
+
V
220 Ω
-
5) According to Ohm’s Law, what is proportional to Current if Resistance is constant?
6) Find 𝑹𝑹𝑶𝑶 for the circuits below.
a.
60 Ω
15 Ω
28 Ω
19 Ω
6Ω
𝑅𝑅𝑇𝑇
b.
10 Ω
25 Ω
50 Ω
20 Ω
16 Ω
28 Ω
22 Ω
𝑅𝑅𝑇𝑇
32 Ω
c.
24 Ω
18 Ω
4Ω
12 Ω
𝑅𝑅𝑇𝑇
9Ω
18 Ω
14 Ω
7Ω
7) Find the quantities for the circuit below.
Supply (𝑷𝑷𝑰𝑰𝑰𝑰 )
+
-
30 V
ƞ𝒐𝒐
Stage 1
80 Ω
Stage 2
Load (𝑷𝑷𝑶𝑶𝑶𝑶𝑶𝑶 )
10 Ω
𝑰𝑰𝟏𝟏
𝑰𝑰𝑺𝑺
ƞ𝟏𝟏
Stage 3
100 Ω
𝑰𝑰𝟐𝟐
ƞ𝟐𝟐
a. Find 𝑰𝑰𝑺𝑺
b. Find 𝑷𝑷𝑰𝑰𝑰𝑰
c. Find 𝑰𝑰𝟏𝟏 , 𝑰𝑰𝟐𝟐 , 𝑰𝑰𝟑𝟑 , and 𝑰𝑰𝑳𝑳 (Hint: Use Current divider)
200 Ω
ƞ𝟑𝟑
𝑰𝑰𝟑𝟑
𝑰𝑰𝑳𝑳
200 Ω
ƞ𝑳𝑳
25 Ω
d. Find 𝑷𝑷𝑳𝑳𝒐𝒐𝒔𝒔 𝟏𝟏 at Stage 1, 𝑷𝑷𝑳𝑳𝒐𝒐𝒔𝒔 𝟐𝟐 at Stage 2, and 𝑷𝑷𝑳𝑳𝒐𝒐𝒔𝒔 𝟑𝟑 at Stage 3
e. Find 𝑷𝑷𝑶𝑶𝑶𝑶𝑶𝑶
f.
Calculate Total Efficiency (ƞ𝑶𝑶𝒐𝒐𝒕𝒂𝒍 ) of the circuit
g. Calculate the Efficiency at each Stage (ƞ𝟏𝟏 , ƞ𝟐𝟐 , ƞ𝟑𝟑 , 𝑎𝑛𝑑 ƞ𝑳𝑳 ). Hint: for each stage 𝑷𝑷𝑰𝑰𝑰𝑰 is
the 𝑷𝑷𝑶𝑶𝑶𝑶𝑶𝑶 from the previous stage. 𝑷𝑷𝑶𝑶𝑶𝑶𝑶𝑶 is 𝑷𝑷𝑰𝑰𝑰𝑰 − 𝑷𝑷𝑳𝑳𝒐𝒐𝒔𝒔 at that stage.
h. Does ƞ𝑶𝑶𝒐𝒐𝒕𝒂𝒍 = ƞ𝟏𝟏 ∙ ƞ𝟐𝟐 ∙ ƞ𝟑𝟑 ∙ ƞ𝑳𝑳 ?
8) Use Voltage Divider ONLY to find all the voltages for the circuit below. Do not simplify the
circuit.
+
+
25 Ω
60 V
𝑽𝑽𝟏𝟏
-
+
-
8Ω
+
26 Ω
𝑽𝑽𝟐𝟐
-
12 Ω
9) Perform a Source Transformation on the Voltage Source and Current Source and then find 𝑰𝑰𝑿 .
(Hint: Use Nodal Analysis to solve for 𝑰𝑰𝑿 after Source Transformation)
12 Ω
48 V
+
-
𝑰𝑰𝒙𝒙
+
6Ω
-
8Ω
1.875 A
𝑽𝑽𝟒𝟒
+
+
17 Ω
𝑽𝑽𝟑𝟑
𝑽𝑽𝟓𝟓
-
10) Find the Thevenin Equivalent from the 𝑹𝑹𝑳𝑳 perspective and draw the New Circuit.
20 Ω
6Ω
5Ω
4Ω
2A
𝑹𝑹𝑳𝑳