Final answer:
The statement about Class 1 Extra Low Voltage Power circuits being unrestricted by current limits according to 16-200 is False (B). High voltage is preferred for power transmission to reduce ohmic losses, and AC voltage is commonly used because it can be easily transformed to different levels for consumer use.
Step-by-step explanation:
The statement that Class 1 Extra Low Voltage Power circuits are circuits which are neither remote control nor signal circuits but which operate at not more than 30 V and where the current is not limited in accordance with 16-200 is False. This statement defines Extra Low Voltage (ELV) circuits, which are indeed limited to a maximum of 30 volts under normal operating conditions, but Class 1 circuits also have current limits for safety purposes, as mentioned in the safety standard 16-200.
Power transmission at high voltages is more economical due to the reduced ohmic losses in transmission lines. Ohmic losses occur because of the resistance present in the transmission lines, which result in the dissipation of electric power. By transmitting power at a high voltage with a low current, losses can be minimized, making the system more cost-effective and efficient. Yet at the point of use, for safety and practical reasons, voltages are brought down to standard values that appliances can handle, which is done easily with AC voltage through the use of transformers.