How many watts does a standard 100-watt light bulb consume per hour?

• A. 50 watts
• B. 100 watts
• C. 150 watts
• D. 200 watts

Answer: (B)

A standard 100-watt light bulb consumes 100 watts of electrical power per hour when it is switched on. The measurement of power in watts refers to the rate at which electrical energy is used. Therefore, when the bulb is operating, it draws 100 watts of energy continuously.

This means if it operates for one hour, it will consume 100 watt-hours of energy, which is equivalent to the power rating of the bulb itself. The consumption aligns directly with its labeled wattage, making it clear that a 100-watt light bulb indeed uses 100 watts per hour.

Understanding this concept is crucial for calculating energy costs and efficiency. Knowing how much energy a device consumes can help in managing electricity usage effectively.