Why are copper oxide rectifiers, associated...

Question 1 / 20P94odTRj7wkHQ2SCnR2t

Question 1 of 20P94odTRj7wkHQ2SCnR2t

Why are copper oxide rectifiers, associated with DC voltmeters to measure AC, unsuitable for the measurement of voltages at radio frequencies?

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Question 1 of 20

P94odTRj7wkHQ2SCnR2t

Why are copper oxide rectifiers, associated with DC voltmeters to measure AC, unsuitable for the measurement of voltages at radio frequencies?

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🔍 Key Concepts

• Copper oxide rectifier behavior at different frequencies (low frequency vs radio frequency) • Effect of shunt (parallel) capacitance on AC measurements, especially at high frequencies • How unintended capacitance can form a bypass path for RF signals, affecting meter readings

💭 Think About

• At radio frequencies, how does even a small capacitance affect impedance and current flow compared with at power-line frequencies (50/60 Hz)? • If a rectifier has a certain shunt capacitance, will that capacitance tend to short-circuit or pass more of the RF signal around the meter movement? • Which option correctly describes the size of the shunt capacitance that would most disturb RF voltage measurements?

✅ Before You Answer

• Compare the reactance of a capacitor at low frequency vs high (radio) frequency: ( X_C = \tfrac{1}{2\pi f C} ). What happens as frequency increases? • Decide whether a large or small shunt capacitance would give more bypassing effect at RF and therefore make the reading unreliable. • Check which choices are mutually exclusive (cannot both be true at once), especially regarding "low" vs "large" shunt capacitance.

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Question 1 of 20

Why are copper oxide rectifiers, associated with DC voltmeters to measure AC, unsuitable for the measurement of voltages at radio frequencies?

Because of the relatively low shunt capacitance of the copper oxide rectifier

The AC & DC voltages will read low

Because of the relatively large shunt capacitance of the copper oxide rectifier

All of the above

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Question 1 / 20P94odTRj7wkHQ2SCnR2t

Question 1 of 20P94odTRj7wkHQ2SCnR2t

Why are copper oxide rectifiers, associated with DC voltmeters to measure AC, unsuitable for the measurement of voltages at radio frequencies?

Back

Question 1 of 20

P94odTRj7wkHQ2SCnR2t

Why are copper oxide rectifiers, associated with DC voltmeters to measure AC, unsuitable for the measurement of voltages at radio frequencies?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed