Electric Power Consumption Calculator
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padding: 20px;
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#powerConsumptionResult, #costResult {
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Electric Power Consumption Calculator
Estimated Consumption & Cost
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Understanding Electric Power Consumption
This calculator helps you estimate the electricity consumption and associated costs of your appliances. Understanding how much power your devices use is crucial for managing your energy bills and making informed decisions about your energy usage.
How it Works: The Math Behind the Calculation
The calculation is based on the fundamental principles of electrical power and energy.
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Power Rating (Watts): This is the rate at which an appliance consumes energy. It's typically listed on the appliance's label. For example, a 100-watt light bulb uses 100 joules of energy every second.
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Energy Consumption (Watt-hours, Wh): To find out how much energy an appliance uses over a period, we multiply its power rating by the time it's used.
Energy (Wh) = Power Rating (Watts) × Usage Time (Hours)
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Kilowatt-hours (kWh): Electricity is typically billed in kilowatt-hours (kWh). Since 1 kilowatt (kW) = 1000 watts (W), we convert Watt-hours to Kilowatt-hours by dividing by 1000.
Energy (kWh) = Energy (Wh) / 1000
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Total Energy Consumption: The calculator determines daily, weekly, monthly, and yearly consumption based on your input for average daily usage and days per week.
- Daily kWh:
(Power Rating (W) × Hours Per Day (h)) / 1000
- Weekly kWh:
Daily kWh × Days Per Week
- Monthly kWh:
Weekly kWh × (52 weeks / 12 months) (approximated as 4.33 weeks/month)
- Yearly kWh:
Weekly kWh × 52 weeks
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Cost Calculation: The cost is calculated by multiplying the total energy consumed (in kWh) by the price you pay per kWh.
Cost = Energy Consumed (kWh) × Cost Per kWh ($)
Typical Appliance Power Ratings (Watts):
- LED Light Bulb: 5-15 W
- Incandescent Light Bulb: 60-100 W
- Laptop: 50-100 W
- Desktop Computer + Monitor: 150-300 W
- Television (LED): 50-200 W (depending on size)
- Refrigerator: 100-200 W (continuous, but cycles)
- Washing Machine: 300-1000 W (during operation)
- Microwave: 800-1500 W
- Hair Dryer: 1200-1800 W
Why Use This Calculator?
- Budgeting: Estimate monthly and yearly electricity expenses for specific appliances.
- Energy Efficiency: Identify high-consumption devices and consider upgrades to more energy-efficient models.
- Behavioral Changes: Understand the impact of usage habits (e.g., leaving lights on) on your bill.
- Solar/Battery Planning: Get a rough idea of energy needs for off-grid systems or solar panel sizing.
By inputting the details of your appliances, you can gain valuable insights into your household's energy footprint and take steps towards reducing both consumption and costs.
function calculateConsumption() {
var powerRatingWatts = parseFloat(document.getElementById("powerRatingWatts").value);
var hoursPerDay = parseFloat(document.getElementById("hoursPerDay").value);
var daysPerWeek = parseFloat(document.getElementById("daysPerWeek").value);
var costPerKwh = parseFloat(document.getElementById("costPerKwh").value);
var applianceName = document.getElementById("applianceName").value || "Appliance";
// Input validation
if (isNaN(powerRatingWatts) || powerRatingWatts <= 0 ||
isNaN(hoursPerDay) || hoursPerDay < 0 ||
isNaN(daysPerWeek) || daysPerWeek 7 ||
isNaN(costPerKwh) || costPerKwh < 0) {
alert("Please enter valid positive numbers for power rating, hours per day, days per week (0-7), and cost per kWh.");
return;
}
// Calculate energy consumption
var dailyKwh = (powerRatingWatts * hoursPerDay) / 1000;
var weeklyKwh = dailyKwh * daysPerWeek;
// Approximation for monthly: 52 weeks / 12 months = 4.33 weeks/month
var monthlyKwh = weeklyKwh * (52 / 12);
var yearlyKwh = weeklyKwh * 52;
// Calculate costs
var dailyCost = dailyKwh * costPerKwh;
var weeklyCost = weeklyKwh * costPerKwh;
var monthlyCost = monthlyKwh * costPerKwh;
var yearlyCost = yearlyKwh * costPerKwh;
// Display results
document.getElementById("powerConsumptionResult").textContent = dailyKwh.toFixed(2);
document.getElementById("resultUnit").textContent = "kWh per day";
document.getElementById("dailyCost").textContent = "Daily Cost: $" + dailyCost.toFixed(2);
document.getElementById("weeklyCost").textContent = "Weekly Cost: $" + weeklyCost.toFixed(2);
document.getElementById("monthlyCost").textContent = "Monthly Cost: $" + monthlyCost.toFixed(2);
document.getElementById("yearlyCost").textContent = "Yearly Cost: $" + yearlyCost.toFixed(2);
}