Community College
Department of Applied Medical Sciences
Section of Medical Equipment
MASH 207 — Electric Circuit
Time: 90 minutes
Midterm exam 311
Date: 1/12/1431
Answer Sheet MT1 – MASH 207 – 1/12/1431
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MASH 207 — Electric Circuit
Time: 90 minutes
Midterm exam 311
Date: 1/12/1431
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) For a circuit that contains a 50 V power supply and a 100 Ω resistor, what power rating should
1) _______
be assigned to the resistor?
A) 25 W
B) 125W
C) 2.5 W
D) 250 W
2) Kirchhoff's law for parallel circuits states that the:
A) sum of currents into a junction is equal to the difference of all the branch currents.
B) sum of all branch voltages equal zero.
C) sum of the total currents flowing out of a junction equals the sum of the total currents
flowing into that junction.
D) total circuit resistance is less than the smallest branch resistor.
2) _______
3) Current equals:
A) voltage × time
3) _______
B)
D) coulombs × time
C)
4) Convert 10,000 ohms to kΩ.
A) 1 kΩ
B) 10 kΩ
4) _______
C) 1000 kΩ
5) If V = 50 V and R = 100 kΩ the current equals ________.
A) 500 μA
B) 50 mA
C) 0.5 mA
D) 100 kΩ
5) _______
D) both A and C
6) What is the total current of a series circuit with a 9 V battery, a 4.7 kΩ, a 6.1 kΩ resistor, and a
450 Ω resistor?
A) 23.4 mA
B) 1.9 mA
C) 800 μA
D) 20 mA
6) _______
7) Convert 4,600,000 Ω to Mega Ω.
A) 4600 Mega Ω
B) 460 Mega Ω
7) _______
C) 46 Mega Ω
D) 4.6 Mega Ω
8) 2 μF = ________
A) 2000 nF
C) 2 × 10-6 F
D) both A and C
8) _______
B) 200 pF
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9) To obtain voltage in volts, you must express the value of I in ________ and the value of R in
________.
A) Milliamperes, Megohms
B) Milliamperes, Ohms
C) Amperes, Kilo-Ohms
D) Amperes, Ohms
9) _______
10) 50 mA of current flows through a 10 kΩ resistor. How much power is dissipated?
A) 25 mW
B) 0.25 μW
C) 25 W
D) 5 μW
10) ______
11) How much current flows when a 15 ohm resistor is connected across a 5 V source?
A) 3.0 A
B) 0.33 A
C) 0.5 A
D) 3.3 A
11) ______
12) The total resistance of a parallel circuit:
A) is the inverse of the total circuit conductance.
B) equals the sum of the total circuit conductance.
C) equals the sum of all the branch resistances.
D) is always greater than the largest branch resistance.
12) ______
13) If the total voltage applied in a series circuit of three resistors is 120 V and the voltage drop
across R1 is 20 V and R2 drops 30 V, what is the voltage drop for R3?
13) ______
A) 70 V
14) Siemens is a unit for:
A) power
B) 50 V
C) 120 V
D) 40 V
14) ______
B) conductance
C) voltage
D) resistance
Figure 3-6
15) Given the circuit in Figure 3-6, What is the voltage across the resistor?
A) 50 mV
B) 2.0 V
C) 2.0 mV
15) ______
D) 50 V
Figure 4-3
16) If you installed a 33 Ω, 1 watt resistor in the circuit in Figure 4-3, the resistor will probably:
A) produce a little heat
B) burn up
C) work fine
D) short
16) ______
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Figure 5-5
17) The total resistance in the circuit in Figure 5-5 is:
A) 23,416.2 Ω
B) 709.2 kΩ
17) ______
C) 2907 Ω
D) 927 Ω
Figure 5-9
18) The total current flowing in the circuit in Figure 5-9 is:
A) 2.82 A
B) 1.06 A
C) 0.53 A
18) ______
D) 0.35 A
Figure 6-4
19) Given the circuit in Figure 6-4, find the current through R1.
A) 0.187 A
B) 24.8 mA
C) 0.25 A
19) ______
D) 0.024 A
20) Given the circuit in Figure 6-4, find the current through R2.
A) 0.187 A
B) 0.125 A
C) 24.8 mA
20) ______
D) 0.25 A
Figure 6-6
21) Given the circuit in Figure 6-6, find the total current.
A) 0.3 A
B) 0.3 mA
C) 0.2 A
21) ______
D) 0.02 A
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Figure 7-2
22) Given the circuit in Figure 7-2, which resistors are in series?
A) R1, R2 and R5
B) R1, R2 and R3
C) R3 and R4
22) ______
D) R3, R4 and R5
Figure 7-4
23) Given the circuit in Figure 7-4, calculate the current at Point A.
A) 1.2 A
B) 2 A
C) 0.67 A
23) ______
D) 0.8 A
Figure 7-5
24) Given the circuit in Figure 7-5, calculate the total resistance.
A) 12 kΩ
B) 7 kΩ
C) 34 kΩ
24) ______
D) 3 kΩ
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Figure 7-8
25) Given the circuit in Figure 7-8, what is the current through R3?
A) 35 mA
B) 0.35 A
C) 208 mA
25) ______
D) 0.35 mA
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Answers MT1 – 207 MASH – 1/12/1431
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