Illuminating Joy

Good job! That's the right answer. The higher the amperage, which flows through the bulb, the brighter the light of the bulb.

From the two experiments we can make the following conclusion:

• The higher the voltage that powers the light bulb, the brighter it will burn.
• The higher the amperage that flows through the bulb, the brighter it will burn.

The higher a bulb burns, the more electric power is transformed into light and warmth. This electric power of the bulb depends on the amperage, which flows through the bulb, and the voltage, which powers the bulb.
This relation is not only the case with light bulbs! It is generally true:

electric power = voltage ⋅ amperage

This can be expressed in a formula:

Now you've found out the effect of amperage and voltage on the electric power of a light bulb with the help of some little experiments. Can you now apply your new knowledge on the brain-teaser from the beginning?