electronics.js

function Resistors() {}

function Resistor(resistance) {
    resistance = +resistance;
    if(isNaN(resistance)){
        throw TypeError()
    }
    var props = {
        "resistance": {
            get: function () {
                return resistance;
            }
        }
    }
    Object.defineProperties(this, props)
}

Resistors.series = function (resistors) {
	var sum;
	resistors.forEach(){

	}
}

Resistors.parallel = function () {

}