b) Draw a schematic circuit diagram that will produce the dimmest bulb. Current must be … values for series and parallel resistances agree with the predicted values using Ohm’s Law? These are connected with wires, which for our purposes can be regarded as conductors with zero resistance. In this experiment you will study the properties of resistors, lamps and LED’s and determine the range over which they obey Ohm’s Law. See the slide presentation on the lab website (linked in the left bar under Experiments/PowerPoint) for …

Resistors in Series and Parallel Resistors in series are connected as in Figure 1. There is only one path for a current, I , to follow and the same current will pass through each resistor. The voltage across the series is the sum of the individual voltage drops. … … 2 1 2 1 total ? ? ? ? ? ? IR IR V V V (2) Equation (2) shows that resistors in series are equivalent to a single resistor, R series , whose value is found by … 2 1 series ? ? ? R R R (3) When resistors are connected in parallel, there are multiple paths for the current to follow. The voltage across them is the same and the individual currents must be added to find the total current in the combination … … 2 1 2 1 total ? ? ? ? ? ? R V R V I I I (4) The voltage is the same for all the terms, so equation (4) becomes ? ? ? ? ? ? ? ? ? ? ? … 1 1 2 1 total R R V I (5) Equation (5) shows that resistors in parallel are equivalent to a single resistor, R parallel , whose value is found by R parallel ? 1 1 R 1 ?1 R 2 ?…. (6) Prelab Question 2 : You are given three resistors, a flashlight bulb in a socket, a battery, and all the connecting wire you need. The resistors are 50, 100, and 150 ohms. a) Draw a schematic circuit diagram that will produce the brightest bulb. Current must be flowing in all circuit components. b) Draw a schematic circuit diagram that will produce the dimmest bulb. Current must be flowing in all circuit components.

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