6A63 - If a vacuum tube with a filament rating of 0.25 A and 5 V is operated from a 6 volt battery, what value of resistor is necessary?
- Correct answer
A.4 ohms
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B.5 ohms
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C.10 ohms
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D.2 ohms
This question is one of 100 in FCC Radiotelegraph Element 6 2014. Test yourself on all of them.
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