Which characteristic is true for high voltage powerlines?

The statement that high voltage powerlines are uninsulated and carry high voltage is accurate because high voltage powerlines are specifically designed to transmit electricity over long distances with minimal energy loss. To achieve this, they operate at high voltages, which helps to reduce the current flowing through the conductors and, consequently, the resistive losses in the lines.

Additionally, high voltage powerlines often do not have insulation like lower voltage electrical systems. Instead, they rely on physical separation from the ground and surrounding objects to reduce the risk of accidental contact and ensure safety. The frames and poles supporting these lines are constructed to maintain the necessary clearance from the ground and other structures, further enhancing safety measures. This characteristic is critical for the efficient transmission of electricity and plays an important role in the overall safety protocols in place around high voltage installations.

In contrast, the options that suggest insulation is present or that the lines can be touched without risk are misleading, as they ignore the inherent dangers associated with high voltage. Similarly, the claim that they carry low voltage directly conflicts with the established definition of high voltage systems.