Understanding Electrical Costs for Lighting: A Practical Example
Understanding Electrical Costs for Lighting: A Practical Example
When it comes to managing household budgets, understanding the cost associated with electricity consumption is crucial. This article provides a clear and detailed example of calculating the weekly cost of a light bulb operating in a standard apartment circuit to help homeowners make informed decisions about their energy usage.
Introduction to Electricity Costs and Calculation
In the digital age, everyone is aware of the importance of budgeting and energy efficiency. However, in many households, the actual cost of running electrical devices can sometimes be overlooked. This article will guide you through the process of calculating the weekly cost of an active light bulb in a typical apartment setting, focusing on the voltage, current, and electricity rate.Calculating the Energy Consumption
Let's consider a light bulb in your apartment that operates with a voltage of 220V and a current of 0.5A. To determine the energy consumption, we can use the following formula:Power (P) Voltage (V) x Current (I)
Power (P) 220V x 0.5A 110W
This means the light bulb consumes 110 watts of power. To convert this into kilowatts, we divide by 1000:
110W 0.11kW (kilowatts)
Now, let's calculate the weekly energy consumption:
Energy consumption per day 0.11kW x 24 hours Weekly energy consumption 0.11kW x 24 hours x 7 days 18.48kWh
This means the light bulb consumes approximately 18.48 kilowatt-hours (kWh) of electricity per week.
Calculating the Cost
If the local electricity rate is 125 sum per kWh, we can calculate the weekly cost as follows:Cost per week 18.48kWh x 125 sum/kWh 2310 sum
Therefore, the correct answer is Option B, 2310 sum.