Which of the following statements is true about electricity in a circuit?

The statement that "Electricity instantly acts when voltage is applied" is based on the principle that when voltage is introduced into a circuit, it establishes an electric field that causes electrons to move almost instantaneously throughout the conductive path. This movement of electrons is what we recognize as electric current.

The second part of the statement, "No electricity flows if not connected to a load," aligns with Ohm’s Law and basic circuit theory. A circuit requires a closed loop, which often includes a load (like a light bulb or a motor) to allow current to flow. If there is no load, there is no complete path for the electrons to travel, which means that even if a voltage is applied, the current will remain at zero.

Taken together, these two statements reinforce fundamental concepts in electricity that emphasize the relationship between voltage, current, and circuit integrity. Both concepts are essential to understanding how electric circuits operate, making the combination of these statements true. The other options do not accurately reflect the behavior of electricity in a circuit.