Which of the following is an example of wasted energy in electrical devices?

In the context of electrical devices, wasted energy refers to the energy that is not used for its intended purpose and is often lost as heat. Heat generation occurs due to the resistance encountered when electricity flows through components such as wires and circuit elements. This resistance leads to the conversion of some electrical energy into thermal energy, which dissipates into the environment rather than contributing to the device's function.

For instance, in a light bulb, some of the electrical energy is converted to light, but a significant amount is lost as heat, making it an example of wasted energy. This effect is common in many electrical devices, including motors and resistors, where the electrical energy is not fully utilized for performing the desired work.

Other options such as voltage loss relate more to the inefficiency of energy transmission rather than internal energy waste, pulsed current refers to a type of electrical flow that can influence how energy is delivered, and capacitance describes the ability of a component to store electrical energy but does not inherently indicate wastage. Hence, heat generation is the direct example of energy being wasted in electrical devices.