Which formula correctly calculates energy in kilowatt-hours (kWh)?

The formula that correctly calculates energy in kilowatt-hours (kWh) is based on the relationship between power and time. Energy consumption in kilowatt-hours is defined as the product of power (measured in kilowatts) and the time (in hours) that the power is used.

When utilizing this formula, you are essentially measuring how much power is consumed over a specific period. For example, if an appliance uses 2 kW of power for 3 hours, the energy consumed would be 2 kW x 3 hours = 6 kWh. This concept is fundamental in understanding how energy usage is calculated on utility bills, making it critical for utility marketing representatives.

The other formulas do not appropriately yield energy in kilowatt-hours. One, for example, mentions voltage and current, which relate to the basic principles of electrical systems but do not directly calculate energy as needed. Another option refers to power and time but does not express it in the correct units and context. Lastly, the mention of mass and gravity pertains to mechanical energy calculations rather than electrical energy, which is outside the scope of kilowatt-hour calculations.