Which of the following statements is true about voltage?

The statement that voltage is present without current flow in an outlet is accurate because voltage, often referred to as electrical potential difference, can exist in a circuit even when it is open, meaning that the circuit is not complete and current cannot flow. In an outlet, voltage is available across the terminals, but unless there is a path for current to travel (which requires a closed circuit), there will be no current flow. This is a fundamental concept in electrical theory; voltage can be present and measurable even if there is no electrical current moving through the circuit.

Understanding this principle is crucial for working safely and effectively with electrical systems, as it highlights the potential hazards of voltages present in outlets and wiring, which can be live even if nothing is connected to draw current.