Final answer:
Devices primarily carry current rather than transform resistivity to voltage. Transformers convert AC to DC voltage for various electronics, while voltage sources create the potential difference that drives electric current in accordance with Ohm's Law.
Step-by-step explanation:
Devices are equipment whose primary function is to carry current, not to transform resistance of wire to voltage. However, a common misconception about device chargers is that they are batteries. In reality, many devices use DC (Direct Current), such as computers, cell phones, and flashlights. To maintain a current, various devices create a potential difference and are referred to as voltage sources. A well-known device for this purpose is a transformer, which converts AC (Alternating Current) potential to DC potential. Transformers are integral in the charging process for electronic devices, changing AC voltage from wall outlets into the DC voltage that devices require.
The driving force behind the current is the electric field created by the potential difference V applied by the voltage source. Contrary to option (a), transformers do not transform current to voltage but, as correctly stated in option (b), transform voltages from one value to another. Ohm's Law is central to understanding how the potential difference, material characteristics, and resistivity influence the amount of current flowing through a conductor.