Resistors in Parallel

In this part of the lab, you are going to explore the characteristics of a circuit with resistors in parallel. Use your assigned values for battery voltage and resistance to assemble the circuit shown below ( notice the use of additional ammeters):

In a parallel circuit, the voltage drops across each resistor should equal the voltage of the battery. Using the voltmeter you will demonstrate that this is true for the circuit you’ve created. Record your results in the table below:

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R1 Voltage R2 Voltage Battery Voltage
     

The current through each resistor is affected by the branching in the parallel circuit. In the table below, record the current coming out of the battery, the current going into each resistor and the current flowing back to the battery.

Current Out of Battery Current to R1 Current to R2 Current Into Battery
       

Since the voltage across each resistor in a parallel circuit is the same, we approach finding the equivalent resistance from the sum of the currents. This gives the following relationship for calculating the equivalent resistance in a parallel circuit.

Using the relationship for resistors in parallel, find the equivalent resistance in the circuit you’ve assembled and record in the table below:

Resistor 1 Resistor 2 Equivalent Resistance
     

Apply Ohm’s Law to your circuit to calculate the current to demonstrate that the ammeter reading is correct ( recall that now R is the equivalent resistance in the circuit).

 
Result of this calculation =   A

Questions

If you were to have three resistors in parallel, how would you determine the equivalent resistance of the circuit.

Make a statement regarding the voltage drop across each of the three resistors in your new circuit and how it would relate to the voltage of the battery.

Make a statement regarding the current through each of the three resistors in your new circuit and how it would relate to the overall current.

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