Current and Power Consumption of Lamps

Why does a 100-W lamp glow brighter than a 25-W lamp?

What is the relationship between power consumption and current drawn by lamps?

Answer:

A 100-W lamp draws more current than a 25-W lamp under the same voltage. This enables it to consume more power and glow brighter.

When it comes to comparing the brightness of lamps based on their power ratings, the power consumption plays a crucial role. The power consumed by a lamp is directly related to the current it draws and the voltage supplied to it. This relationship is described by the formula P = IV, where P is power, I is current, and V is voltage.

For lamps operating under the same voltage, a higher power rating means the lamp will draw more current in order to consume that power. Therefore, a 100-W lamp draws more current compared to a 25-W lamp, allowing it to glow brighter.

The power equation illustrates that as power increases, so does the current. This principle explains why lamps with higher power ratings appear brighter than those with lower power ratings when connected to the same voltage source.

While the basic concept holds true, it's important to note that factors like temperature affecting the resistance of the lamp can influence the current drawn. Energy-efficient alternatives such as CFL and LED bulbs provide comparable brightness while consuming less power and drawing less current.

In summary, the relationship between power consumption, current, and brightness of lamps is crucial in understanding why a 100-W lamp glows brighter than a 25-W lamp under the same voltage supply.