Do you want to know the electricity cost of keeping a light bulb lit for a whole year? With a few simple calculations, you can easily estimate this. This article will guide you step by step on how to calculate the electricity cost of a light bulb, helping you make sense of your electricity bill!

1. Wattage Electricity Cost Calculation Table (Theoretical Values for Reference)

2. Electricity Consumption Calculation

The wattage of a bulb is key to determining its electricity usage. Here, we will use a 1-watt (1W) bulb as an example (you can adjust according to your bulb wattage; this is just for illustration) to calculate its electricity consumption over one year.

• Bulb Wattage: 1W (you can adjust according to your bulb wattage; this is just for illustration)
• Daily Usage Time: 24 hours
• Days in a Year: 365 days

The daily consumption formula is:
Wattage × Usage Time (hours)
Thus, 1W × 24 hours = 24 watt-hours, which equals 0.024 kWh (1 kWh = 1000 watt-hours).

Next, we calculate the total consumption for a year:
0.024 kWh × 365 days = 8.76 kWh

3. Monthly Cost Calculation

In addition to annual costs, understanding monthly electricity costs can be very useful. The average monthly consumption can be calculated using the following formula:

Monthly Consumption:
Annual Consumption ÷ 12 months
That means 8.76 kWh ÷ 12 = 0.73 kWh.

Assuming the price of electricity per kWh is NT$3 (as an example based on typical prices in Taiwan), the monthly cost will be:
0.73 kWh × NT$3 = NT$2.19.

So, for a 1W bulb continuously lit, the monthly electricity cost is approximately NT$2.19.

4. Annual Cost Calculation

Now, let's take a look at the calculation for annual electricity costs. Assuming the price per kWh is NT$3 (typical electricity prices in Taiwan range from NT$2.5 to NT$3; please check your local utility rates for specifics).

The formula is:
Annual Consumption (kWh) × Price per kWh
That means 8.76 kWh × NT$3 = NT$26.28.

Thus, if a 1W bulb is kept lit continuously for a year, the electricity cost would be approximately NT$26.28.

Summary

Through this simple calculation method, you can easily determine the monthly and annual electricity costs for any wattage bulb. All you need to know is the wattage, daily usage time, and electricity price, and you can quickly find out the cost. Give it a try and create a small electricity budget for the light fixtures in your home!

Note: The costs mentioned above are based on electricity prices in Taiwan.