Lilly und Fred at full power!
 Fred |
 Lilly |
„I've got it! Electrical power probably tells us how much electrical energy is transformed into light energy after a certain time.“
„And both are plucked in a household electric socket where we always have 230V. How can it be then that both lamps burn differently brightly? “
„Electric power not only depends on the voltage, Fred. Electric power is the product of voltage and amperage! “
„Then we would have the following rule: if either the voltage or the amperage drops, the electric power of the light bulb decreases and it thus sines less brightly.“
„Sure thing! I write to Jenny and Mike straightaway. This should surely help them!
And we also know now why it is a lot darker in our room than before. “
And we also know now why it is a lot darker in our room than before. “
„Okay. The 40W-bulb has a lower power output than the 60W-bulb. The voltage in our room hasn't changed. This means that the new bulb with the 40W has made the amperage drop. “
„Exactly! The 40W-bulb, which I've screwed in, has lower electric power than the old 60W-bulb. At the same voltage the bulb therefore emits less light power. But Jenny and Mike just use one light bulb ... “
„ But Lilly, remember there are different values of household voltage in the USA and in Germany! That's why I think... Nah! The both will find it out on their own! “
You surely also have an idea how to answer Jenny and Mike's question, haven't you?
