Yes, it is normal to hear a slight electrical sound when the Xiaomi Multifunctional Rice Cooker 1.5L is on standby. This phenomenon does not affect the normal operation or safety of the rice cooker and is part of its typical electrical operation under standby mode. This sound is caused by the oscillations generated in the power circuit of the rice cooker, particularly from the transformer and inductive components operating under AC power. These components naturally produce a low-level hum or electrical noise during operation.
Additionally, the local power grid conditions and potential interference from other household appliances can also contribute to the sound level. If you find the sound bothersome due to interference, it's advisable to unplug the power cord and switch off the rice cooker to minimize any disruption.