If there are no control devices, a load in a line diagram is considered to be...

In a line diagram, a load without control devices is typically considered to be in the "ON" state. This is because the absence of control devices implies that there is no mechanism to interrupt the flow of electricity to the load. A load is effectively powered and operational unless a switch or some form of control is present to disconnect it.

The concept assumes that when controlling mechanisms—like switches, relays, or sensors—are absent, there is nothing to inhibit the power supply, thus allowing the load to operate continuously. In practical terms, this means that as long as a voltage is applied, the load would be engaged and performing its function.

Understanding this helps in recognizing how line diagrams represent operational states of various components, which is crucial for troubleshooting and design in electrical circuits. The incorrect options suggest other states that imply some form of disconnection or inactivity, which does not align with the explanation of how loads function in the absence of control devices.