I. Electrical load and redundancy explanation.
Most of us are aware that a jet has two engines, so that if one engine fails the pilot can land safely with the help of the other engine. (The jet is allowed to fly only if both the engines are in working condition.) The same concept is applied for various systems in a spacecraft or spaceship (called redundancy explained below)
The explanation is technical as one has to understand how safety is designed in a spacecraft or spaceship.
Here the meaning of load is Electrical load.
An electrical load refers to the measure of the total amount of electricity required to operate an appliance, the lights or outlets.
Redundancy in design.
One of the most common ways to prevent spacecraft system failures is to design for redundancy. This means having backup components, subsystems, or systems that can take over the function of the primary ones in case of a malfunction. For example, most spacecraft have multiple power sources, such as solar panels, batteries, and fuel cells, that can provide electricity in different scenarios. Redundancy can also be achieved by having different modes of operation, such as low-power or safe mode, that can reduce the demand on the system and preserve its functionality.
https://www.linkedin.com/advice/3/how-do-you-prevent-spacecraft-system-failures?utm_source=share&utm_medium=member_android&utm_campaign=share_via
II. Dialogue from sci-fi movie "The Passengers"
A major system went down somewhere. Everything else is trying to pick up the load, but the load's too heavy."
It means that a major system has failed and other systems are trying to share the load but they are unable to do it. In such a case everything would collapse unless some emergency measures were taken.