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Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

3
votes
A constant current LED driver being specified as "18-24V output" means the output voltage compliance range (where CC operation will be maintained) in constant current mode is 18-24V. Using it with a … LED string with a combined threshold voltage far outside that range can be expected to cause it to shutdown (making the setup useless), overheat (damaging the driver), or lose constant current properties (damaging the LEDs with overcurrent). …
answered Jan 2 '18 by rackandboneman
0
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Independent of the battery problem: If you have a selection of silicon diodes and/or LEDs, these can be used to achieve the kind of voltage drop you need. You might want some resistor parallel to … the IC to get the diode forward voltage into a stable section of the curve. Mind that most ICs absolutely cannot stand being driven with input voltages that exceed their supply voltage. …
answered Apr 11 '18 by rackandboneman
3
votes
Such systems are in use in LED lighting applications (LEDs behave exactly like your question suggests natively), and they also were very relevant in the last decades of widespread vacuum tube technolo …
answered Apr 10 '17 by rackandboneman