Why does the brightness of a bulb not change noticeably when you use longer copper wires to connect it to the battery?Why does the brightness of a bulb not change due to length of wire?Electricity depends on currents, not lengths. Now if you used Tungsten wires, which have a higher resistance, you will notice a larger difference in brightness (it will be darker). This is also evident if you have more loads on the circuit. If 1 circuit had only 1 battery and 1 bulb unit, it will be brighter than 1 battery a 2 bulb units, because it going through more resistance and loads.Why does the brightness of a bulb not change due to length of wire?The amount of current flowing to the bulb is unchanged. Remember, the source of the power may have to put out more voltage to carry that current the extra length though.
Voltage is just a carrier of amperage, the force that actually does the work.
