The Rate at Which a Light Bulb Uses Energy (Converts

question 51

Multiple Choice

The rate at which a light bulb uses energy (converts electrical energy to light and heat) is usually printed on it-for example, "100 watts." A watt is a unit of power, which describes the rate of energy use. A power of 1 watt means that 1 joule of energy is being used each second. Hence, for every second that you leave a 100-watt light bulb turned on, you will have to pay the utility company for 100 joules of energy. Jeffrey Bennett, et al., The Cosmic Perspective, 3^rd edition

• A) Argument; conclusion: The rate at which a light bulb ... printed on it.
• B) Nonargument.
• C) Argument; conclusion: For every second ... 100 joules of energy.
• D) Argument; conclusion: A power of 1 watt ... used each second.
• E) Argument; conclusion: A watt is a unit of power ... rate of energy use.

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