Which of the following is a possible cause of an alarm system drawing excessively on the power supply?

In the context of an alarm system, a touchscreen keypad can contribute to excessive power draw because these keypads typically require more energy than traditional button-based keypads. Touchscreen devices utilize backlighting, touch sensitivity technology, and often have more advanced processing capabilities, all of which can increase their power consumption. If the power supply is not adequately rated to handle the additional load from a touchscreen keypad, it can lead to excessive current draw, which might affect the overall functioning of the alarm system.

While other factors like faulty wiring, low battery, and incompatible sensors can create issues in an alarm system, they typically manifest in different ways rather than through a consistent and excessive power draw. Faulty wiring might lead to shorts or unreliable performance; a low battery would signal a need for replacement rather than a continuous high draw; and incompatible sensors could affect system integration but not necessarily alter power consumption in this manner.