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Question:

Now most LED flashlights are using resistance to drop voltage charging, waste a lot of energy, why manufacturers like to use?

Now most LED flashlights are using resistance to drop voltage charging, waste a lot of energy, why manufacturers like to use?

Answer:

When you turn on the flashlight, you see the simple circuit, and the general mobile phone has an external charger. They did notThat is to say, use 230V to direct decompression.
The resistance drop voltage is only used on the AC circuit, and the flashlight is useless. The LED requires constant current supply and is generally not a simple current limiting resistor.
Mainly low cost, simple, can only be suitable for small lead-acid batteries. Disadvantages, power consumption, low efficiency of poor, can only be combined.

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