Determine the total energy used (in kWH) when a power of 250W is expended for 5 hours.

To determine the total energy used in kilowatt-hours (kWh), you can use the formula:

\[
\text{Energy (kWh)} = \text{Power (kW)} \times \text{Time (hours)}
\]

First, convert the power from watts (W) to kilowatts (kW):

\[
\text{Power (kW)} = \frac{\text{Power (W)}}{1000} = \frac{250 \, \text{W}}{1000} = 0.25 \, \text{kW}
\]

Next, multiply the power in kilowatts by the time in hours:

\[
\text{Energy (kWh)} = 0.25 \, \text{kW} \times 5 \, \text{hours} = 1.25 \, \text{kWh}
\]

So, the total energy used is **1.25 kWh**.

Would you like more details or have any questions?

Here are 8 related questions you might be interested in:
1. How do you calculate energy consumption for multiple devices with different power ratings?
2. What is the cost of 1.25 kWh of energy if electricity costs $0.12 per kWh?
3. How do you convert kilowatt-hours to joules?
4. What is the difference between kWh and kW?
5. How much energy would be used if the power was 500W instead of 250W?
6. How does time affect the total energy consumption?
7. How can energy consumption be reduced in household appliances?
8. What factors influence the power rating of a device?

**Tip:** Always double-check your unit conversions when performing calculations involving energy, power, and time.

Learn how to calculate the total energy used when a power of 250W is expended for 5 hours. Includes step-by-step calculation using the energy formula and unit conversion from watts to kilowatts. Suitable for Grades 7-9.

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