# A lab experiment to investigate the relationship between the three variables in ohms law

## Experiment dc 3 ohms law

How do you think this will affect lights that are strung along a single wire? Record the ammeter and voltmeter readings on your worksheet. Procedure C: Determining R2 Disconnect the first resistor and connect the second resistor as shown in Fig. You will use the circuit board shown in Fig. See Fig. Does your data concur with this? Determine what is required We are required to calculate the current flowing in the circuit. Resistor 2 has Red, Red, Red, Gold bands on it. All the resistors are ohmic in nature. The figure below displays a variable dc power supply. Now replace the original resistor with the remaining resistors, one at a time, each time recording the resistance value and the current you measured. For the following circuit, calculate: the current through the cell To find the current we first need to find the equivalent resistance. Using this we can find the voltage through the each of the resistors. We can use a color coding chart to find the value of carbon resistors.

You will connect the two resistors in parallel and find the equivalent resistance of this parallel combination and compare this equivalent resistance to the theoretical equivalent resistance. What kinds of safety devices prevent this from happening?

The dashed boxes indicate parallel sections of the circuit. The first band of all resistors is the first digit of resistance, the second band is the second digit of resistance.

## Ohms law experiment using breadboard

When your circuit has been approved, connect the remaining wire and read the current that is flowing through the resistor. For the following circuit, calculate: the current through the cell To find the current we first need to find the equivalent resistance. Connect one multimeter in series with the two resistors to read the current flowing in the circuit. To find the voltage we first need to find the equivalent resistance. Sequence of Task and procedures: The first task Predict : what is the relation between the components of the electric circuits? Suppose a single light bulb burns out. Determine how to approach the problem Since the resistors are ohmic in nature, we can use Ohm's Law. The second Task Investigate what was happened when you make changes in the components of the electric circuits? We start by calculating the total resistance of Parallel Circuit 1. You will connect the two resistors in parallel and find the equivalent resistance of this parallel combination and compare this equivalent resistance to the theoretical equivalent resistance. Create a circuit with a battery, a light switch, a wire, and a light bulb, as shown. First draw the circuit before doing any calculations Determine how to approach the problem We need to determine the current through the cell and each of the parallel resistors. Turn on Show current and select Electron flow. Record the actual voltmeter reading and not the value on the power supply as these two readings might be slightly different.

Checkpoint 4: Ask your TA to check your chart, calculations, and Excel graph before proceeding. Here is a chart of the three electrical units we will study in this experiment.

Suppose a single light bulb burns out. Would you expect each to make your results larger or to make them smaller? Determine what is required We are required to calculate the current flowing in the circuit. Figure 1 Water Analogy Water Pressure Amount of water flowing A measure of how difficult it is for water to flow through a pipe.

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