A basic vacuum-tube diode behaves like a valve because electrical current can primarily flow in one direction.
A vacuum tube is also known as electronic valve because?
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Question context
This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.