Basic Physics II Evidences - DrJJ - UiTM

Material SciencePHY407PhETBulbs in parallelV ABVV CDVV EFVV GHVBulb 1 none noneBulb 1 + Bulb 2noneBulb 1 + Bulb 2+ bulb 3LABBulbs in parallelV ABVV CDVV EFVV GHVBulb 1 none noneBulb 1 + Bulb 2noneBulb 1 + Bulb 2+ bulb 3ii)Now place an ammeter between points B and D. Record your reading. Thenplace an ammeter between points C and D and also between points E and Fand between G and H. Record your reading.PhETBulbs in parallelI BDA A A ABulb 1 none none noneBulb 1 + Bulb 2noneBulb 1 + Bulb 2 +bulb 3LABI AB I CD I EF I GHBulbs in parallel A A A ABulb 1 none none noneBulb 1 + Bulb 2noneBulb 1 + Bulb 2 +bulb 3I CDI EFI GHPowerWattsPowerWattsiii)iv)Unscrew the first bulb Observe the brightness of the remaining bulbs andwrite your observation. Then record all the ammeter readings.Unscrew the second bulb leaving only the third bulb in the circuit. Observe thebrightness of the remaining bulb and write your observation. Then record allthe ammeter readings.PhETBulbs in parallelBulb 1 unscrewedBulbs 1 & 2 unscrewedLABBulb 1 unscrewedBulbs 1 & 2 unscrewedI BDAI ABAI CDAI CDAI EFAI EFAI GHAI GHAPowerWattsPowerWattsQuestions1. What happens to the brightness of the first bulb and the current through itwhen a second bulb is added in parallel to the circuit? What about the power?2. What happens to the brightness of the first bulb and the current through itwhen a third bulb is added in parallel to the circuit? What about its power?3. Is there a relationship between the number of bulbs and the total current in acircuit?Created by Dr. JJ, FSG, UiTM Shah Alam Page 6 of 7 3/3/2010