I will assume this is a question on AC power into a building. That is referred to as a brown out.
Brownouts or sags
In the electrical trade it is called control voltage. This voltage can be any voltage. In North America the common control voltage is 120 volts.
This is often called a "voltage drop".
ratio of secondry voltage to primary voltage is called voltage transformation ratio
the incoming voltage from the current source to the transformer is called primary voltage.....
Sags
Brownouts or sags
Brownouts or sags
Brownout
The incoming voltage from the source to the transformer is called primary voltage.
Lamps (not 'bulbs' ; we plant bulbs!) will only produce their rated power at their rated voltage. These values are printed on the glass envelope. Reducing the voltage applied to a lamp will, therefore, reduce the power it produces. In fact, there's not a simple, linear, relationship between a lamp's voltage and its power, and this means that even small reductions in voltage will result in large reductions in power.Operating lamps, or any devices, come to than, at lower voltages really has nothing to do with efficiency. Certainly, operating a lamp below its rated voltage will most-certainly NOT result in high efficiency. Efficiency is defined as the ratio of output power to input power and has nothing to do with voltage.
Reductions of weapons held by multiple nations
In the electrical trade it is called control voltage. This voltage can be any voltage. In North America the common control voltage is 120 volts.
This is called Osteoporosis. A frequent condition in women who undergo hormone reductions as they age.
the device oprates on the minimum voltage. in this voltage is called threshold voltage.
This is often called a "voltage drop".
Secondary voltage.