What is the polarity of voltage at test...

What is the polarity of voltage at test...

Question 1 of 270705eccefa5bacbc34ba4d48710

What is the polarity of voltage at test point 5 (TP5) with respect to ground referring to the circuit shown in the illustration? See illustration EL-0085.

Question 1 of 27070

Q

What is the polarity of voltage at test point 5 (TP5) with respect to ground referring to the circuit shown in the illustration? See illustration EL-0085.

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🔍 Key Concepts

• Identify whether the circuit from TP3 through TP4 is producing rectified DC or AC, and what polarity that DC has with respect to ground. • Look at the orientation of CR1 (the diode across the load) and how it clamps the voltage at the bottom of R1/RL with respect to ground. • Determine whether Q1 is being used as a series pass transistor supplying a regulated DC output, and how that affects the polarity at TP5.

💭 Think About

• Follow the path of conventional current starting at the transformer secondary, through the diodes D1/D2, inductor L1, capacitor C1, and into section D. In what direction does current flow relative to ground? • If CR1 is forward‑biased, what is the maximum negative voltage that the node at the bottom of R1/RL (and thus TP5 through Q1) can reach with respect to ground? Can it swing below ground at all? • In a typical DC power supply with a series pass transistor feeding a load referenced to ground, is the regulated output node normally positive or negative with respect to ground?

✅ Before You Answer

• Confirm the polarity of the rectified and filtered voltage at TP4 with respect to ground before thinking about TP5. • Check the arrow direction on Q1 and the diode symbol on CR1 to see which way current can flow and which polarity they support. • Verify whether any component path would allow TP5 to be driven below ground potential; if not, eliminate any choice that implies that.