Discuss LED Power Rating on information on my 12v lamp in the UK Electrical Forum area at ElectriciansForums.net
Thank you for your reply, it makes sense but your statement about ohms law confuses me, power, voltage, resistance and current can all be obtained with any two readings ..The LED chip itself may be 3.4W but the power used from the circuit is higher due to the loss in the ballast resistors. Same as with fluorescents and discharge lamps, where e.g. a 36W fitting takes a 36W tube but uses more than 36W from the mains due to loss in the control gear.
BTW ohn's law is about resistance not power.
Thanks for clearing that one upYes, but ohm's law only states that the current through a conductor is proportional to the voltage across it (for most materials.) Ohm's law doesn't apply to LEDs since they are semiconductors and do not have a linear relationship between current and voltage. But the power is still voltage multiplied by current, as that relationship doesn't depend on ohm's law.
Reply to LED Power Rating on information on my 12v lamp in the UK Electrical Forum area at ElectriciansForums.net
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