tag:blogger.com,1999:blog-5088860151651047897.post7912462148954877583..comments2024-03-25T10:56:59.380-04:00Comments on Jacobs Physics: Brightness of a bulb -- quantitative demonstrationGreg Jacobshttp://www.blogger.com/profile/03854009948036330746noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5088860151651047897.post-57844916093248456232012-08-25T06:12:26.819-04:002012-08-25T06:12:26.819-04:00Both 2 A, 5 V, and 4 A , 2.5 V have a 10 W power. ...Both 2 A, 5 V, and 4 A , 2.5 V have a 10 W power. What combination makes the bulb brightest?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5088860151651047897.post-14136303019094090352011-07-12T11:11:00.664-04:002011-07-12T11:11:00.664-04:00Nice demo, but the "leading" multiple-ch...Nice demo, but the "leading" multiple-choice question needs work. Using the possessive is very misleading; the bulb does not "have" voltage, current, or power. <br /><br />"He showed with a single light bulb that the bulb's brightness depends on the power, not the voltage or current." Er, no. The bulb's brightness does indeed depend on its resistance, the current through it, and the voltage applied to the circuit. <br /><br />I have found that with circuits, more than any other part of introductory physics, we must take great care in the language we use around the principle terms.Anonymousnoreply@blogger.com