10G Electricity, Ohm's Law
Watch this video: And note important points in physics notebook
You can easily deduce that a resistor resists flow of current and thus creates a voltage drop. Thus resistors con control amount of current in circuit.
With that information in mind, Look at the picture of Rheostat, we used in Exp1 below.
Can you think the purpose of Rheostat in experiment we did.
The coils of wire in Rheostat has some function.
The purpose of rheostat is__________
You are given some resistance and is using the similar arrangement as used in actual experiment. Here we can vary voltage of power supply and thus create more current. Use the simulation to obtain the value of resistance.
The value of resistance is ______ ohms
You can tabulate data and find slope. Or Simply find average of V/I for three sets of reading. Either way you find R
visit the link and 3.2 tab Attempt the activity
Q1
choose the correct answer for above question
Q2
choose the correct answer for above question
Q3
choose the correct answer for above question
A breadboard is used to connect an Led with GPIO Pins of mini Computer ( Raspberry pi)
Q3
Why do you think the resistor is there??
Q4
LED is connected to 5 volt of power using gpio pins. The max current it can allow is 20 mA before getting fused. Suppose the resistance of LED is 10 ohm. What must be the minimum value of Resistor to be used for safe operation of LED.