There are approximately 110 million TVs in the United...

There are approximately 110 million TVs in the United States. Each uses, on average, 75 W of power and is turned on for 6.0 hours a day. If electrical energy costs $\$ 0.12$ per $\mathrm{kWh}$, how much money is spent every day in keeping the TVs turned on?

Key Concepts

Aggregated Consumption Calculation

Aggregated consumption involves scaling the energy consumption of a single device by the total number of devices in use. This step is important for calculating the overall energy consumption when multiple units are operating simultaneously.

Unit Conversion

Unit conversion is crucial when working with energy and power measurements, such as converting watts to kilowatts and watt-hours to kilowatt-hours (kWh). These conversions ensure that the energy values are in the correct units for further calculations, such as applying cost rates.

Cost Calculation

Cost calculation involves multiplying the total energy consumption (usually in kilowatt-hours) by the cost per unit of energy. This step translates the energy usage into monetary expenses, which is critical for budgeting and assessing energy costs.

Power

Power is a measure of the rate at which energy is used or produced, typically measured in watts (W). It indicates how much energy is consumed per unit of time, and understanding its role is essential for determining energy usage over time.

Energy Consumption

Energy consumption is calculated by multiplying power by the time the device is operating. This relationship, expressed as Energy = Power × Time, allows us to estimate the total energy used during a specific period, forming the basis for cost calculations.

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