The Relationship Between Power and Current in Lamps

What is the relationship between the power rating of a lamp and the current drawn by it?

a) The current drawn by a 100-W lamp is:
a) Four times higher than a 25-W lamp.
b) Twice as high as the 25-W lamp.
c) The same as the 25-W lamp.
d) Half of the 25-W lamp.

Answer:

The current drawn by the 100-W lamp is twice as high as the 25-W lamp.

When comparing the power ratings of lamps, such as a 100-W lamp and a 25-W lamp, we can determine the relationship between power and current drawn by the lamps. In this case, the higher the power rating of a lamp, the higher the current it draws.

The relationship between power (P), current (I), and resistance (R) in a lamp is given by the equation P = IV. This equation shows that the power dissipated by a lamp is directly proportional to the current flowing through it. Therefore, a lamp with a higher power rating will draw a higher current compared to a lamp with a lower power rating.

For example, a 100-W lamp will draw twice as much current as a 25-W lamp because the power dissipated by the 100-W lamp is higher, leading to a greater current flow. This relationship is important to understand when selecting lamps for specific applications where the current draw is a critical factor.

By knowing the relationship between power and current in lamps, you can make informed decisions about the type of lamp to use based on the current requirements of your circuit or application.