Definition
A device that absorbs electrical energy in place of the normal load, used to test or operate electrical or radio equipment without connecting it to its actual working load. A dummy load typically consists of a resistor or resistor network rated to handle the equipment's full output as heat, allowing the equipment to be powered up safely and tested without radiating signals or driving the real circuit.
Plain English
A stand-in component that soaks up the electrical power coming out of a piece of equipment, so the equipment can be tested as if it were hooked up for real, but without actually being connected to whatever it normally drives.
Context Anchor
Seen in aircraft electrical and avionics maintenance when equipment must be tested without connecting it to its normal working device.
Derivation
Dummy' here means a substitute or stand-in, used the same way as in 'dummy variable' or 'crash test dummy.' It's not the real load, but it acts like one for testing purposes.
Why Pilots Care
Running a transmitter or generator without a load (or into the wrong load) can damage the equipment. A technician uses a dummy load so the gear can be tested safely on the bench before it's installed back on the aircraft.
Analogy
It is like using a training weight instead of a real piece of equipment: the system still has something to work against, but the real item is not put at risk.
Intuition Check
Dummy does not mean useless here. It means a controlled stand-in for the real electrical load. Load does not mean cargo here. It means the device or circuit that receives electrical power.
Example Sentence 1
Before keying the transmitter on the bench, the technician connected it to a dummy load to absorb the RF output safely.
Example Sentence 2
Using the dummy load during avionics checkout kept the signal from interfering with other aircraft on the ramp.