Deep Dive: G7A04
The correct answer is A: Only one diode is required. A characteristic of a half-wave rectifier in a power supply is that only one diode is required. Half-wave rectifiers use a single diode to rectify one half of the AC cycle. For amateur radio operators, this is the simplest rectifier configuration. Understanding this helps when designing power supplies.
Why Other Answers Are Wrong
Option B: Incorrect. Ripple frequency isn't twice that of full-wave - it's half. Half-wave produces ripple at line frequency, full-wave at twice line frequency. Option C: Incorrect. More current can't be drawn from half-wave - full-wave provides more current because it uses both AC halves. Half-wave is less efficient. Option D: Incorrect. Output voltage isn't two times peak input - output is less than peak input due to diode drop. Two times peak isn't correct.
Exam Tip
Half-wave rectifier characteristic = only one diode required. Think 'H'alf-'W'ave = 'H'as 'W'one diode. Half-wave rectifiers use single diode to rectify one half of AC cycle. Not ripple frequency, not more current, not 2× voltage - just one diode.
Memory Aid
Half-wave rectifier characteristic = only one diode required. Think 'H'alf-'W'ave = 'H'as 'W'one diode. Half-wave rectifiers use single diode. Simplest rectifier configuration.
Real-World Example
A half-wave rectifier uses a single diode. The diode conducts during one half of the AC cycle, blocking the other half. This is the simplest rectifier - only one diode is needed. However, it's less efficient than full-wave because it only uses half the AC cycle.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G7A
Reference: 2023-2027 Question Pool · G7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G7A topic.