A 40.0 W bulb used 1280 J of energy. How much time did that take?

To calculate the time it took for a 40.0 W bulb to use 1280 J of energy, we can use the formula:

\[
P = \frac{E}{t}
\]

Where:
- \(P\) is the power (in watts, W),
- \(E\) is the energy (in joules, J),
- \(t\) is the time (in seconds, s).

Rearranging the formula to solve for time:

\[
t = \frac{E}{P}
\]

Substitute the given values:

\[
t = \frac{1280 \, \text{J}}{40.0 \, \text{W}} = 32.0 \, \text{seconds}
\]

So, it took **32.0 seconds** for the 40.0 W bulb to use 1280 J of energy.

Would you like any further details on this? 

Here are some related questions:
1. How do you convert power from watts to kilowatts?
2. What other units can power be measured in?
3. How does the energy consumption of a bulb relate to its voltage and current?
4. How would the time change if the power of the bulb were increased?
5. What is the relationship between energy, power, and time in electrical systems?

**Tip:** To easily calculate the time taken for any device, just remember that power is the rate at which energy is used!

Learn how to calculate the time it takes for a 40.0 W light bulb to use 1280 J of energy. This problem involves using the formula relating power, energy, and time, and is suitable for students in Grades 9-12.

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