How much energy does a 1,500W heater consume in 3 hours?

To calculate the energy consumed by a heater in watt-hours, you need to multiply the power rating of the heater by the duration for which it operates. In this case, the heater has a power rating of 1,500 watts and operates for 3 hours.

The formula to determine the energy consumption in watt-hours is straightforward:

Energy (in watt-hours) = Power (in watts) × Time (in hours)

Substituting the values:

Energy = 1,500 watts × 3 hours = 4,500 watt-hours

This means that over the course of 3 hours, the 1,500W heater consumes 4,500 watt-hours of energy. Understanding this simple multiplication of power and time helps in evaluating the energy usage for various appliances and is fundamental in HVAC practices, as energy consumption is a critical element in system design and efficiency assessments.