What is the significance of voltmeter sensitivity expressed in ohms per volt?
The correct answer is A: The full scale reading of the voltmeter multiplied by its ohms per volt rating is the input impedance of the voltmeter. What is the significance of voltmeter sensitivity expressed in ohms per volt is that the full scale reading multiplied by ohms per volt rating equals the input impedance. Ohms per volt allows calculation of input impedance. For amateur radio operators, this is important for test equipment. Understanding this helps when using voltmeters.
Exam Tip
Voltmeter ohms per volt significance = full scale reading × ohms per volt = input impedance. Think 'O'hms 'P'er 'V'olt = 'O'utput 'P'erformance 'V'alue (input impedance). Ohms per volt allows calculation of input impedance. Not power drawn, not voltage, not shunt size - just input impedance.
Memory Aid
"Voltmeter ohms per volt significance = full scale reading × ohms per volt = input impedance. Think 'O'hms 'P'er 'V'olt = 'I'nput 'I'mpedance. Ohms per volt allows calculation of input impedance. Important for test equipment."
Real-World Application
Voltmeter sensitivity in ohms per volt: The full scale reading of the voltmeter multiplied by its ohms per volt rating equals the input impedance. For example, a 10V full scale meter with 20,000 ohms per volt has 200,000 ohms input impedance. This is the significance - full scale × ohms per volt = input impedance.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Reading in volts multiplied by ohms per volt doesn't determine power drawn - full scale multiplied by ohms per volt equals input impedance. Power drawn isn't the significance.
Option C: Incorrect. Reading in ohms divided by ohms per volt doesn't determine voltage - full scale multiplied by ohms per volt equals input impedance. Voltage determination isn't the significance.
Option D: Incorrect. Full scale in amps divided by ohms per volt doesn't determine shunt size - full scale multiplied by ohms per volt equals input impedance. Shunt size isn't the significance.
题目解析
The correct answer is A: The full scale reading of the voltmeter multiplied by its ohms per volt rating is the input impedance of the voltmeter. What is the significance of voltmeter sensitivity expressed in ohms per volt is that the full scale reading multiplied by ohms per volt rating equals the input impedance. Ohms per volt allows calculation of input impedance. For amateur radio operators, this is important for test equipment. Understanding this helps when using voltmeters.
考试技巧
Voltmeter ohms per volt significance = full scale reading × ohms per volt = input impedance. Think 'O'hms 'P'er 'V'olt = 'O'utput 'P'erformance 'V'alue (input impedance). Ohms per volt allows calculation of input impedance. Not power drawn, not voltage, not shunt size - just input impedance.
记忆口诀
Voltmeter ohms per volt significance = full scale reading × ohms per volt = input impedance. Think 'O'hms 'P'er 'V'olt = 'I'nput 'I'mpedance. Ohms per volt allows calculation of input impedance. Important for test equipment.
实际应用示例
Voltmeter sensitivity in ohms per volt: The full scale reading of the voltmeter multiplied by its ohms per volt rating equals the input impedance. For example, a 10V full scale meter with 20,000 ohms per volt has 200,000 ohms input impedance. This is the significance - full scale × ohms per volt = input impedance.
错误选项分析
Option B: Incorrect. Reading in volts multiplied by ohms per volt doesn't determine power drawn - full scale multiplied by ohms per volt equals input impedance. Power drawn isn't the significance. Option C: Incorrect. Reading in ohms divided by ohms per volt doesn't determine voltage - full scale multiplied by ohms per volt equals input impedance. Voltage determination isn't the significance. Option D: Incorrect. Full scale in amps divided by ohms per volt doesn't determine shunt size - full scale multiplied by ohms per volt equals input impedance. Shunt size isn't the significance.
知识点
Voltmeter sensitivity, Ohms per volt, Full scale reading, Input impedance
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.