lab report 3

# lab report 3 - 1 Lab report#3 RESISTORS AND LIGHT BULBS 2...

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10/19/09 Lab report #3 RESISTORS AND LIGHT BULBS 1

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Abstract Out goal was to check if a bulb acts like a resistor or not. We needed to make a direct comparison between a resistor and a light bulb. Through experiment we checked if bulb is a constant resistor and how a bulb’s resistance changes as the current changes. Our results show the light bulbs do not act like resistors do in terms of resistance. Predictions According to Ohm’s law: V IR = Where V is the potential difference measured across the resistance, I is the current through the resistance and R is the resistance of the conductor. The relationship between the potential difference and the current is linear, where the resistance is the slope. The graph of I vs. V would be of that type: As more current goes through a light bulb, it gets brighter. As it gets brighter, it gets hotter. I expect the increasing temperature to affect the resistance of the bulb Experiment and results We first examine the resistance of the resistor. We connect the power supply, the resistor and the digital multimeter as shown: Conclusions Acknowledgements 2 V I
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lab report 3 - 1 Lab report#3 RESISTORS AND LIGHT BULBS 2...

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