A laptop computer consumes about 20 watts per hour when operating. At 10¢ per kilowatt-hour, how much does a laptop cost to operate for 5 hours?

To calculate the cost of operating a laptop for 5 hours, we need to follow these steps:

1. **Find the total energy consumed:**
   - Power consumption = 20 watts = 0.02 kilowatts (since 1 kilowatt = 1000 watts).
   - Time = 5 hours.

   So, total energy consumed $ = 0.02 \, \text{kilowatts} \times 5 \, \text{hours} = 0.1 \, \text{kWh} $.

2. **Calculate the cost:**
   - Cost per kilowatt-hour (kWh) = 10¢ = $0.10.
   - Total cost = $ 0.1 \, \text{kWh} \times 0.10 \, \text{dollars per kWh} = 0.01 \, \text{dollars} $.

Thus, the cost to operate the laptop for 5 hours is **1 cent** ($0.01).

Would you like any further clarification or additional details?

Here are some related questions:
1. How much does it cost to operate the laptop for 24 hours?
2. How many kilowatt-hours does the laptop consume in 1 week, assuming 8 hours of daily use?
3. If the power rate increased to 12¢ per kilowatt-hour, what would the new cost be for 5 hours?
4. How much power would a more efficient laptop, using 15 watts per hour, consume in the same 5 hours?
5. How does power consumption change if the laptop is in sleep mode?

**Tip:** Always convert watts to kilowatts when calculating energy costs, as electricity rates are usually in kilowatt-hours.

Learn how to calculate the cost of operating a laptop that consumes 20 watts per hour. Using energy consumption formulas and unit conversions, find the total cost at 10¢ per kilowatt-hour for 5 hours of usage. Suitable for middle school students (Grades 6-8).

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