Question 19 (1 point) A \( 100- \) W light bulb is left on for 10.0 hours. Over this period of time, how much energy was used by the bulb? 1) 1000 J 2) 3600 J 3) 3600000 J 4) 1.34 hp 5) 1000000 J

To find the energy used by a \( 100 \)-W light bulb left on for \( 10 \) hours, we can use the formula: \[ \text{Energy} = \text{Power} \times \text{Time} \] The power is \( 100 \) W and the time is \( 10 \) hours, which we convert to seconds: \[ 10 \text{ hours} = 10 \times 3600 \text{ seconds} = 36000 \text{ seconds} \] Now, plugging the values into the formula: \[ \text{Energy} = 100 \text{ W} \times 36000 \text{ s} = 3600000 \text{ J} \] So the answer is 3) \( 3600000 \text{ J} \). In 1990, when the United States adopted energy labels for appliances, it revolutionized how consumers understood power consumption. For example, a \( 100 \)-W bulb burning for a long period became a talking point in energy conversations, as families started calculating their electricity bills better! If you're looking to cut down on your energy bills, it’s essential to be aware of how much power your appliances consume. A common mistake is underestimating usage time—always remember, even small appliances add up over time! Swapping out old bulbs for energy-efficient LEDs can significantly reduce consumption without sacrificing brightness.