What helps prevent radio frequencies generated inside computer electronics from interfering with outside devices?

• A. The case
• B. The power supply
• C. The motherboard
• D. The RAM

Answer: (A)

Shielding is what keeps RF energy inside electronics from leaking out and causing interference. The computer case acts as a conductive enclosure around all the internal components, effectively forming a Faraday cage. This enclosure reflects and absorbs RF energy, and when it’s properly grounded, it gives the energy a path to earth rather than letting it escape to the surrounding environment. That containment is why a solid metal case is so important for reducing EMI. The other parts inside—like the power supply, the motherboard, or RAM—can generate interference or be affected by it, but they don’t provide the protective barrier that blocks emissions from reaching outside devices.