Shielded wire is primarily used to reduce which issue?

Shielded wire is primarily used to reduce which issue?

• A. Increased resistance
• B. Weight
• C. Heat buildup
• D. EMI/RFI interference

Answer: (D)

Shielded wire is used to prevent electromagnetic interference from and to the conductors inside a cable. The conductive wrap around the conductor, often braided copper or foil, is tied to ground so external electromagnetic fields induce current mainly in the shield rather than in the signal wires, and so the shield can carry away the unwanted noise. This keeps signals clean and helps avionics and sensors resist disruption from nearby electrical equipment, radio transmitters, or ignition systems. Shielding is the primary tool for reducing EMI and RFI, even though it adds some weight and cost and can alter impedance slightly. It is not primarily about reducing resistance or heat buildup in the conductor.

Shielded wire is used to prevent electromagnetic interference from and to the conductors inside a cable. The conductive wrap around the conductor, often braided copper or foil, is tied to ground so external electromagnetic fields induce current mainly in the shield rather than in the signal wires, and so the shield can carry away the unwanted noise. This keeps signals clean and helps avionics and sensors resist disruption from nearby electrical equipment, radio transmitters, or ignition systems. Shielding is the primary tool for reducing EMI and RFI, even though it adds some weight and cost and can alter impedance slightly. It is not primarily about reducing resistance or heat buildup in the conductor.