Which materials are used for the winding and casing of power resistors to withstand high temperatures?

Which materials are used for the winding and casing of power resistors to withstand high temperatures?

• A. Fiber; Plastic
• B. Copper; Glass
• C. Wire; Ceramic
• D. Aluminum; Ceramic

Answer: (C)

Power resistors are built to handle high temperatures, so both parts must be chosen for heat resistance and reliable electrical performance. The winding needs a conductor that can stay stable and resist oxidation when hot, so a heat‑resistant wire (often an alloy used for resistance) is used for the windings. The outer shell or casing should be able to withstand high temperatures, provide solid mechanical support, and insulate electrically, which is why ceramic is used. Ceramic resists heat well, remains physically strong, and insulates effectively. The other material pairings don’t meet these requirements. Fiber or plastic casings would soften or burn under high heat. Copper windings don’t hold up well at elevated temperatures in resistors, and glass isn’t robust enough for the mechanical demands. Aluminum isn’t ideal for the winding in high‑temperature resistor applications, and while ceramic is good for the casing, the combination of a suitable high‑temperature winding with a ceramic shell is what makes the winding/casing pairing correct.

Power resistors are built to handle high temperatures, so both parts must be chosen for heat resistance and reliable electrical performance. The winding needs a conductor that can stay stable and resist oxidation when hot, so a heat‑resistant wire (often an alloy used for resistance) is used for the windings. The outer shell or casing should be able to withstand high temperatures, provide solid mechanical support, and insulate electrically, which is why ceramic is used. Ceramic resists heat well, remains physically strong, and insulates effectively.

The other material pairings don’t meet these requirements. Fiber or plastic casings would soften or burn under high heat. Copper windings don’t hold up well at elevated temperatures in resistors, and glass isn’t robust enough for the mechanical demands. Aluminum isn’t ideal for the winding in high‑temperature resistor applications, and while ceramic is good for the casing, the combination of a suitable high‑temperature winding with a ceramic shell is what makes the winding/casing pairing correct.