Which is equal to 3000 milliamperes?
The correct answer is D: 3 amperes. 3000 milliamperes equals 3 amperes. The prefix 'milli-' means one-thousandth, so 1 milliampere = 0.001 amperes. To convert milliamperes to amperes, divide by 1,000.
3000 mA ÷ 1,000 = 3 A. This is a straightforward current unit conversion. Milliamperes (mA) are commonly used for smaller currents, while amperes (A) are used for larger currents. Understanding these conversions is essential for reading equipment specifications and calculating power requirements.
Exam Tip
Milliamperes to amperes = Divide by 1000. Remember: To convert milliamperes to amperes, divide by 1,000. 3000 mA ÷ 1000 = 3 A.
Memory Aid
"**M**illiamperes **T**o **A**mperes = **M**ove **T**hree **D**ecimal **P**laces **L**eft (think 'MTA = MTDPL' = Move Three Decimal Places Left, divide by 1000)"
Real-World Application
Your transceiver might draw 3000 milliamperes (3 amperes) when transmitting at full power. This current draw is important for sizing your power supply and wiring. A power supply rated for 5 amperes can easily handle 3 amperes. Understanding that 3000 mA = 3 A helps you read specifications correctly.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 0.003 amperes equals 3 milliamperes, not 3000 milliamperes. You divided by 1,000,000 instead of 1,000.
Option B: Incorrect. 0.3 amperes equals 300 milliamperes, not 3000 milliamperes. You're off by a factor of 10.
Option C: Incorrect. 3,000,000 amperes is way too large. You multiplied instead of dividing.
题目解析
The correct answer is D: 3 amperes. 3000 milliamperes equals 3 amperes. The prefix 'milli-' means one-thousandth, so 1 milliampere = 0.001 amperes. To convert milliamperes to amperes, divide by 1,000. 3000 mA ÷ 1,000 = 3 A. This is a straightforward current unit conversion. Milliamperes (mA) are commonly used for smaller currents, while amperes (A) are used for larger currents. Understanding these conversions is essential for reading equipment specifications and calculating power requirements.
考试技巧
Milliamperes to amperes = Divide by 1000. Remember: To convert milliamperes to amperes, divide by 1,000. 3000 mA ÷ 1000 = 3 A.
记忆口诀
**M**illiamperes **T**o **A**mperes = **M**ove **T**hree **D**ecimal **P**laces **L**eft (think 'MTA = MTDPL' = Move Three Decimal Places Left, divide by 1000)
实际应用示例
Your transceiver might draw 3000 milliamperes (3 amperes) when transmitting at full power. This current draw is important for sizing your power supply and wiring. A power supply rated for 5 amperes can easily handle 3 amperes. Understanding that 3000 mA = 3 A helps you read specifications correctly.
错误选项分析
Option A: Incorrect. 0.003 amperes equals 3 milliamperes, not 3000 milliamperes. You divided by 1,000,000 instead of 1,000. Option B: Incorrect. 0.3 amperes equals 300 milliamperes, not 3000 milliamperes. You're off by a factor of 10. Option C: Incorrect. 3,000,000 amperes is way too large. You multiplied instead of dividing.
知识点
Current conversion, Milliamperes, Amperes, Unit conversion
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.