COMPTIA A+ Practice Exam

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What is the characteristic impedance of RG-59 cable?

  1. 50 Ohms

  2. 60 Ohms

  3. 75 Ohms

  4. 100 Ohms

The correct answer is: 75 Ohms

RG-59 cable is a coaxial cable that is widely used for delivering video signals. It has an impedance of 75 Ohms, which is the ratio of voltage to current in a transmission line. This impedance is important because it determines the level of signal reflection and loss in the cable. Option A, 50 Ohms, is the characteristic impedance of RG-58 cable, which is commonly used for radio frequency applications. Option B, 60 Ohms, is not a standard impedance for any type of cable. Option D, 100 Ohms, is the characteristic impedance of twisted pair cables, used for telephone and Ethernet connections. Therefore, it is important to select the appropriate impedance for the type of cable being used, to ensure optimum signal transmission.

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