Without a preamble.

And someone tried in a professional forum, where specialists gathered who ate a dozen dogs in this profession, to ask a simple question on the topic of the forum?
For example, in a forum of electricians ask: "How to measure the current passing through a pocket lamp connected to a KBS battery?"

The first answer will be: "There are no telephones in the forum, tell the lamp and battery parameters."
The second: “Well, you are a fool. Who connects a 300-ma lamp to a 100-match battery?”
Third: “You can’t measure the current because the resistance of the bulb is nonlinear and depends on the voltage.”
The fourth: Google helps you. Do you know how to use search engines? Go to a professional forum, distract people.”
Fifth: "It is impossible to measure the current received from the battery. The battery is consumed in the process of burning the lamp and unambiguous indicators will not work."
Sixth: "Specify where the device described will be used? If on the laboratory table - it is one thing, and if in an aggressive environment, it is quite another."
Seventh: “Where did you find the “lights from the pocket light”? What is this device? LEDs are now used in lamps. Don’t confuse it with your finger.”
Eighth: "What length of wire do you use and what section?"
9 “Have you not been to school? So take a textbook for 9th grade and read it on page 47.
The tenth... and the following will explain to you all the aspects of the problem, from the battery device to the Masonic conspiracy to produce low-life bulbs, and you will be given all the psychiatric diagnoses from idiotism to schizophrenia.

And only if you are very lucky, then on the twenty-fifth page of the discussion someone will answer that you need to turn an ampere into the gap of one wire between the battery and the bulb.