Deep Dive: T5C10
The correct answer is B: 30 watts. With a voltage of 12 volts DC and a current of 2.5 amperes, the power delivered is 30 watts. Using the power formula P = I × E: P = 2.5 A × 12 V = 30 watts. This is a straightforward application of the power formula. 12 volts is a common battery voltage, and 2.5 amperes is a moderate current draw. The calculation is simple: 2.5 × 12 = 30. This power level might represent a small transceiver or a receiver's power consumption.
Why Other Answers Are Wrong
Option A: Incorrect. 4.8 watts would be the result of dividing (12 / 2.5 = 4.8), not multiplying. Power is I × E, not E / I. Option C: Incorrect. 14.5 watts would be the result of adding (12 + 2.5 = 14.5), not the correct power calculation. Option D: Incorrect. 0.208 watts would be the result of dividing (2.5 / 12 = 0.208), not the correct power calculation.
Exam Tip
Power = Current × Voltage. Remember: P = I × E. 2.5 A × 12 V = 30 W. Simple multiplication.
Memory Aid
**2**.**5**A × **1**2V = **3**0W (think '2.5 × 12 = 30')
Real-World Example
A small receiver operating from a 12-volt battery draws 2.5 amperes. The power consumed is 2.5 × 12 = 30 watts. This tells you the receiver's power consumption, which helps you calculate how long the battery will last and size appropriate power supplies.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T5C
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 T5C topic.