What is the electrical term for the force that causes electron flow?
The correct answer is A: Voltage. Voltage is the electrical term for the force that causes electron flow (current) in a circuit. Voltage is also called 'electromotive force' or 'electrical pressure' - it's the potential difference that pushes electrons through a circuit.
Voltage is measured in volts (V). Think of voltage like water pressure in a pipe - the higher the pressure (voltage), the more water (current) flows. In a circuit, voltage is the 'push' that makes electrons move. Without voltage, there's no force to cause current flow. A battery provides voltage - the chemical reaction creates a voltage difference between the terminals, which causes current to flow when a circuit is connected.
Exam Tip
Force causing flow = Voltage. Remember: Voltage is the force (electrical pressure) that causes electron flow. It's measured in volts.
Memory Aid
"**V**oltage = **V**ery **I**mportant **F**orce (think 'V = VIF' = Very Important Force, causes flow)"
Real-World Application
Your 12-volt battery provides voltage (electrical pressure) that pushes electrons through your transceiver's circuits. The 12 volts is the 'force' that causes current to flow. If the battery voltage drops (say to 10 volts), there's less 'push', so less current flows and your transceiver might not work properly. Voltage is the driving force behind current flow.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Ampere-hours measure battery capacity (charge), not the force that causes current flow.
Option C: Incorrect. Capacitance is the ability to store energy in an electric field, not the force causing current flow.
Option D: Incorrect. Inductance is the ability to store energy in a magnetic field, not the force causing current flow.
题目解析
The correct answer is A: Voltage. Voltage is the electrical term for the force that causes electron flow (current) in a circuit. Voltage is also called 'electromotive force' or 'electrical pressure' - it's the potential difference that pushes electrons through a circuit. Voltage is measured in volts (V). Think of voltage like water pressure in a pipe - the higher the pressure (voltage), the more water (current) flows. In a circuit, voltage is the 'push' that makes electrons move. Without voltage, there's no force to cause current flow. A battery provides voltage - the chemical reaction creates a voltage difference between the terminals, which causes current to flow when a circuit is connected.
考试技巧
Force causing flow = Voltage. Remember: Voltage is the force (electrical pressure) that causes electron flow. It's measured in volts.
记忆口诀
**V**oltage = **V**ery **I**mportant **F**orce (think 'V = VIF' = Very Important Force, causes flow)
实际应用示例
Your 12-volt battery provides voltage (electrical pressure) that pushes electrons through your transceiver's circuits. The 12 volts is the 'force' that causes current to flow. If the battery voltage drops (say to 10 volts), there's less 'push', so less current flows and your transceiver might not work properly. Voltage is the driving force behind current flow.
错误选项分析
Option B: Incorrect. Ampere-hours measure battery capacity (charge), not the force that causes current flow. Option C: Incorrect. Capacitance is the ability to store energy in an electric field, not the force causing current flow. Option D: Incorrect. Inductance is the ability to store energy in a magnetic field, not the force causing current flow.
知识点
Voltage, Electromotive force, Electrical pressure, Volts
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.