Lab: Simple Circuits

Lab: Simple Circuits

Open Ended

What is the resistance in a circuit that allows the flow of 9 A of current with a potential difference of 18 V?

Open Ended

What is the resistance in a circuit that allows the flow of 18 A when 18 V of potential difference are present?

Relationship between R and I

• Can be established by using the two problems just discussed

• Problem 1

• R = 2 Ohms, I = 9 A

• Problem 2

• R = 1 Ohm, I = 18 A

• In problem 2, I doubled the current. How did it affect the resistance?

• Remember, 1 ohms/2 ohms = 0.5

Multiple Choice

Relationship:

As the current doubles, the resistance will

• double

• triple

• half

• quadruple

Checking the Relationship

To check the relationship we are going to draw a simple circuit consisting of:

a battery

a resistor

an ammeter (to read current)

a voltmeter (to read potential difference)

Data

You will change the resistance values by clicking on the resistor and adjusting.

Fill in the table. This table will only allow you to see the relationship between R and I, to see the relationship between R and V, we will have to use a different circuit.

Analysis

You will answer the questions based on your data.

You won't be able to see by how much a simple increases or decreases will be enough for these questions?