This excercise will help you determine the relationship between voltage (V), amperage (I) and resistance (R). This relationship is called Ohm's Law
This experiment consists of modifying a circuit. The circuit is made up of four parts:
The problem consists of two parts:
The first part will be discovered through a trial-and-error experiment. You are given a circuit on which you may vary the voltage by choosing from a variety of batterys and the resistance by adding resistors to the circuit. You will then turn on the switch, allowing current to flow through the circuit. If the resistance is too low, the lightbulb will receive too much energy, and will explode. If the resistance is too great, the lightbulb will not receive enough energy, and will not light. If the resistance is just right, the lightbulb will light up.
If the lightbulb explodes or fails to light, turn off the switch (which automatically replaces the lightbulb) and try again.
First, concentrate on changing the resistance to get the lightbulb to turn on. Once you get a working circuit write down your values, change the value of the battery, and try again. You should begin to see the relationship between V, I, and A. You should then be able to derive what the Amperage of the lightbulb is.
Each battery and resistor has a value printed on it which reflects the objects voltage and resistance, respectively.
In this next circuit, the lightbulb has a different amperage than in the previous experiment. Furthermore, we will tell you what the amperage of the lightbulb is. Given this information, you should be able to complete the circuit correctly with one try.