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Discussion
Home
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Electrical Engineering
‣
Quantities and Units
Comments
Question
When these numbers are multiplied, (6 × 10
3
) (5 × 10
5
), the result is
Options
A. 3 × 10
8
B. 30 × 10
8
C. 300 × 10
9
D. 3,000 × 10
7
Correct Answer
30 × 10
8
Quantities and Units problems
Search Results
1. When these numbers are added, (87 × 10
5
) + (2.5 × 10
6
), the result is
Options
A. 1.12 × 10
4
B. 11.2 × 10
5
C. 112 × 10
5
D. 1,120 × 10
6
Show Answer
Scratch Pad
Discuss
Correct Answer: 112 × 10
5
2. The number of millivolts in 0.06 kilovolts is
Options
A. 600 V
B. 6,000 mV
C. 60,000 mV
D. 600,000 mV
Show Answer
Scratch Pad
Discuss
Correct Answer: 60,000 mV
3. Seven thousand volts can be expressed as
Options
A. 7 kV
B. 7 MV
C. 7 mV
D. either 7 kV or 7 mV
Show Answer
Scratch Pad
Discuss
Correct Answer: 7 kV
4. The quantity 3.3 × 10
3
is the same as
Options
A. 330
B. 3,300
C. 33,000
D. 0.0033
Show Answer
Scratch Pad
Discuss
Correct Answer: 3,300
5. Eighteen thousand watts is the same as
Options
A. 18 mW
B. 18 MW
C. 18 kW
D. 18 µW
Show Answer
Scratch Pad
Discuss
Correct Answer: 18 kW
6. The number 65,000 expressed in scientific notation as a number between 1 and 10 times a power of ten is
Options
A. 0.65 × 10
4
B. 6.5 × 10
4
C. 65 × 10
4
D. 650 × 10
3
Show Answer
Scratch Pad
Discuss
Correct Answer: 6.5 × 10
4
7. What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?
Options
A. 8.2 kΩ
B. 820 Ω
C. 8.2 Ω
D. 82 Ω
Show Answer
Scratch Pad
Discuss
Correct Answer: 82 Ω
8. When there is 12 mA of current through a 1.2 kΩ resistor, the voltage across the resistor is
Options
A. 14.4 V
B. 1.4 V
C. 100 V
D. 10 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 14.4 V
Explanation:
V = IR (Ohms Law)
= 12 X 10
-3
X 1.2 X 10
3
= 12 X 1.2
= 14.4 V
9. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.
Options
A. 40 Ω
B. 4 Ω
C. 2 Ω
D. 20 Ω
Show Answer
Scratch Pad
Discuss
Correct Answer: 20 Ω
10. What is the voltage source for a circuit carrying 2 A of current through a 36 Ω resistor?
Options
A. 1.8 V
B. 18 V
C. 7.2 V
D. 72 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 72 V
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