Final answer:
Track lighting load in residences is calculated by adding the power ratings of all the fixtures on the circuit. The power can be found using the formula P = IV if the voltage and current are known. Energy consumption can be estimated based on daily usage time, and energy efficiency and costs can be managed by considering the type of lighting and usage patterns.
Step-by-step explanation:
To calculate the track lighting load in residences, add up the power ratings (P) of all the light fixtures on the circuit. If the operating current (I) is known instead, and assuming a standard household voltage (V) of 120V, you can calculate the power using the formula P = IV. This will give you the total wattage (power consumption) for all the lighting fixtures on the track. For instance, using the given examples, if Stairs I lighting and Stairs II lighting have an operating current (I(F)) of 86 and a power consumption (P) of 120W, then each consumes 120W of power.
When estimating energy consumption, consider the daily usage time for each appliance. A toaster has a higher rating than a digital clock because it requires more power to generate heat. Fluorescent lights are noted for their efficiency compared to incandescent lights, something to consider when looking to reduce energy consumption. To determine the cost of energy wasted by lights left on, take the total power consumed (wattage multiplied by hours of use) and multiply by the cost of electricity per kilowatt-hour.