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L05_Power

# L05_Power - IUPUI PHYS 251 LAB Page 1 of 2 ELECTRIC POWER...

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IUPUI PHYS 251 LAB Page 1 of 2 ELECTRIC POWER OBJECTIVE To understand electric power distribution in simple series-parallel circuits EQUIPMENT battery eliminator, 5 identical miniature light bulbs (with mounts), patch cords, connectors (alligator or fork shaped) THEORY Ohm’s Law for resistors is V = IR , where I is its current, R is its resistance, and V is its voltage (difference). The electric power for any dc circuit component is given by P=IV . Each series resistor has the same current and a power P = I ( IR ) = I 2 R . Each parallel resistor has the same voltage and a power R V V R V P 2 = = . The brighter the light bulb, the greater its power consumption. PROCEDURE Set the battery eliminator at 3 VDC. Connect each mounted light bulb to the battery eliminator, one at a time, and note the brightness. This represents the “baseline” power level for each bulb. In the following expressions, P1 refers to the power of bulb 1, P2 to the power of bulb 2 and so on. LAB ASSIGNMENT:

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L05_Power - IUPUI PHYS 251 LAB Page 1 of 2 ELECTRIC POWER...

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