When configured to measure current, how is a multimeter connected to a component?
The correct answer is A: In series. When configured to measure current, a multimeter is connected in series with the component. Series connection means the meter becomes part of the current path, so all current flows through the meter. This allows the meter to measure the current flowing through the circuit. For amateur radio operators, understanding series connection for current measurement is essential. The meter must be in the current path to measure it. Connecting in parallel would short-circuit the component and could damage the meter. Most multimeters have separate current input jacks and require you to move the probe to the current measurement position.
Exam Tip
Current measurement = series connection. Think 'C'urrent = 'C'onnected in 'C'ircuit (series). Current meters must be in the current path to measure it. Parallel connection would short-circuit the component.
Memory Aid
"Current measurement = Series connection. Think 'C'urrent = 'C'onnected in 'C'ircuit (series). Must be in the current path to measure current flow."
Real-World Application
To measure the current through a circuit, you break the circuit and insert the multimeter (set to current mode) in series. The current flows through the meter, which measures it. The meter becomes part of the circuit path. If you connected it in parallel, you'd short-circuit the component and potentially damage the meter.
Key Concepts
Why Other Options Are Wrong
Option B (In parallel): Incorrect. Connecting a current meter in parallel would create a short circuit across the component, potentially damaging both the meter and the circuit. Current meters must be in series.
Option C (In quadrature): Incorrect. Quadrature refers to a 90-degree phase relationship, not a connection method. This isn't a valid connection type.
Option D (In phase): Incorrect. 'In phase' refers to signals having the same phase, not a connection method. This isn't how current meters are connected.
题目解析
The correct answer is A: In series. When configured to measure current, a multimeter is connected in series with the component. Series connection means the meter becomes part of the current path, so all current flows through the meter. This allows the meter to measure the current flowing through the circuit. For amateur radio operators, understanding series connection for current measurement is essential. The meter must be in the current path to measure it. Connecting in parallel would short-circuit the component and could damage the meter. Most multimeters have separate current input jacks and require you to move the probe to the current measurement position.
考试技巧
Current measurement = series connection. Think 'C'urrent = 'C'onnected in 'C'ircuit (series). Current meters must be in the current path to measure it. Parallel connection would short-circuit the component.
记忆口诀
Current measurement = Series connection. Think 'C'urrent = 'C'onnected in 'C'ircuit (series). Must be in the current path to measure current flow.
实际应用示例
To measure the current through a circuit, you break the circuit and insert the multimeter (set to current mode) in series. The current flows through the meter, which measures it. The meter becomes part of the circuit path. If you connected it in parallel, you'd short-circuit the component and potentially damage the meter.
错误选项分析
Option B (In parallel): Incorrect. Connecting a current meter in parallel would create a short circuit across the component, potentially damaging both the meter and the circuit. Current meters must be in series. Option C (In quadrature): Incorrect. Quadrature refers to a 90-degree phase relationship, not a connection method. This isn't a valid connection type. Option D (In phase): Incorrect. 'In phase' refers to signals having the same phase, not a connection method. This isn't how current meters are connected.
知识点
Current measurement, Series connection, Multimeter configuration, Ammeter connection
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.