For a 12-volt system with a 1 amp load, how long will the system operate with a 0.5 amp draw?

To determine how long a 12-volt system with a 1 amp load will operate under a 0.5 amp draw, you need to understand the relationship between current, load, and operating time.

The total capacity of the system can be calculated based on the initial load, which is 1 amp. With a constant load, the system can run for a duration determined by the battery capacity. However, when the load changes to 0.5 amps, it effectively reduces the demand on the system.

If the original load was 1 amp, and now it is reduced to 0.5 amps, the system will last twice as long because it's using only half of the available current. This means that if the system can theoretically operate for 1 hour with a 1 amp draw, it will extend its operating time to 2 hours when the draw is reduced to 0.5 amps.

Thus, the correct option indicates that the system will operate for 2 hours at a 0.5 amp draw, reflecting an efficient use of the available battery power under reduced load conditions.