Which device is commonly used as a load in circuits to convert electrical energy into light and heat?

Which device is commonly used as a load in circuits to convert electrical energy into light and heat?

• A. A resistor
• B. Lightbulb
• C. A battery
• D. A switch

Answer: (B)

In circuits, a load is any component that consumes electrical energy and transforms it into other forms. The device that routinely converts electrical energy into both light and heat is the lightbulb. An incandescent bulb changes most of the energy into visible light, with a significant portion released as heat from the hot filament. A resistor also consumes energy and becomes heat, but it doesn’t emit light, so it doesn’t meet the “light and heat” part of the description. A battery acts as a energy source, not a load, and a switch controls the circuit without consuming energy. So the lightbulb best fits the idea of a load that produces both light and heat.

In circuits, a load is any component that consumes electrical energy and transforms it into other forms. The device that routinely converts electrical energy into both light and heat is the lightbulb. An incandescent bulb changes most of the energy into visible light, with a significant portion released as heat from the hot filament. A resistor also consumes energy and becomes heat, but it doesn’t emit light, so it doesn’t meet the “light and heat” part of the description. A battery acts as a energy source, not a load, and a switch controls the circuit without consuming energy. So the lightbulb best fits the idea of a load that produces both light and heat.