Ampere’s Circuital Lawstates the relationship between thecurrentand themagnetic fieldcreated by it. This law states that the integral ofmagnetic field density(B) along an imaginary closed path is equal to the product ofcurrentenclosed by the path and permeability of the medium. ...
An analog voltmeter works by measuring the current through a fixed resistor. Now, according to Ohm’s law, the current through the resistor is directly proportional to the voltage or potential difference across the fixed resistor. Thus, we can determine the unknown voltage. Another example of a ...