how do you calculate readings on an ammeter? whats the formula?

Question

theeric · Answer

Hi! Do you mean an analog ammeter?

kropot72 · Answer

You need to provide a circuit diagram with values of voltage and resistance. The location of the ammeter in the circuit must be shown. Then the appropriate method of finding the current reading on the ammeter can be shown to you.

shane_b · Answer

If you're just reading an ammeter...the calculation is done for you.  That's like asking how to calculate a thermometer.

If you're asking about calculating what an ammeter should read in a given circuit then see @kropot72's answer.

theeric · Answer

http://www.meterbuilder.com/mb1/mb1-images/meter-scales/custom-scales/generic-meter-apps/rf-ammeter-high-scales.jpg https://www.dlsweb.rmit.edu.au/toolbox/electrotech/toolbox1204/resources/01principles/07measurement/images/meter_multi_analogue.jpg http://ecx.images-amazon.com/images/I/91fJanLjGiL._SL1500_.jpg The top two are examples of not immediately intuitive scales, and the third is an analog multimeter.