Inventor Hounsfield was at Electrical Musical Instruments
Sonar.
If it pertains to electrical controls on a machine then the safety device is called an emergency stop button.
You record the electrical activity of the heart with a machine called ECG machine. Leads are attached to the limbs and then you have chest leads put on the chest wall in different positions to produce a tracing of the electrical activity called electrocardiograph
dynamo or generator
Electronic
That machine is called a speaker or a loudspeaker. It converts electrical signals into sound waves by vibrating a diaphragm to produce audible sound.
A machine that converts one form of energy into another form is called a transducer.
The machine used to check electrical brain waves is called an electroencephalogram (EEG). It records the brain's electrical activity through electrodes placed on the scalp, helping to diagnose conditions such as epilepsy, sleep disorders, and brain injuries.
That's called a generator.
A synchronous machine is called a reversible machine because it can operate in both motor and generator modes. In motor mode, it converts electrical energy into mechanical energy to produce motion, while in generator mode, it converts mechanical energy into electrical energy. This ability to switch between modes makes it reversible.
That's called an electric motor.
I would be quite happy about it, because grounding (sometimes called "earthing") really reduces your risk of electric shock from the equipment.