Deep Dive: T5A02
The correct answer is B: Watts. Electrical power is measured in watts (abbreviated as 'W'). Power represents the rate at which electrical energy is used or converted - how much energy per unit time. Power is calculated as Voltage × Current (P = E × I). One watt equals one joule per second. When you see specifications like '50 watts output' or '100W transmitter', that's referring to electrical power. Power is important in amateur radio for understanding transmitter output, power supply requirements, and energy consumption. Watt-hours (Wh) measure energy (power × time), not power itself.
Why Other Answers Are Wrong
Option A: Incorrect. Volts measure voltage, not power. Voltage is electrical pressure, while power is the rate of energy use. Option C: Incorrect. Watt-hours measure energy (power × time), not power itself. Power is measured in watts, energy in watt-hours. Option D: Incorrect. Amperes measure current, not power. Power = Voltage × Current, so you need both voltage and current to calculate power.
Exam Tip
Power = Watts. Remember: Electrical power is measured in watts (W). Power is the rate of energy use, while watt-hours measure total energy.
Memory Aid
**P**ower = **W**atts (think 'P = W' = Power = Watts)
Real-World Example
Your transceiver outputs 50 watts of RF power when transmitting. This means it's using electrical energy at a rate of 50 watts. If you transmit for 1 hour, you've used 50 watt-hours of energy. The 'watts' tells you the power (rate), while 'watt-hours' tells you the total energy consumed over time.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T5A
Reference: FCC Part 97.313
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T5A topic.