LAB HELP

Ohm’s Law

Theory

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inverse proportional with the resistance.

V = I R

V = Voltage

I = Current

R = Resistant

Procedure

The lab activity uses a simulation developed by the University of Colorado at Colorado Boulder.

Ohm’s Law Click here

1. Set the value of R to 75 Ω by adjusting the slide bar.

2. Set the value of V to 1.5V by adjusting the slide bar.

3. Record the value of the electric current in the table. Notice that mA=10-3A.

4. Change the valued of V consecutively to 3V, 4,5V and 6V and record each time the value of the electric current.

5. Take a screen shot of the circuit with and paste it below:

6. Repeat step 2 and 3 for V = 4.5 v and V = 6 v and write down the results at third and fourth rows.

I (Amps]	V (VOLT)
	1.5
	3
	4.5
	6

7. Plot the graph of V vs I V (Volt) on the Y axis and I (Amps) on X axis ) and Paste it here. Please use graphing paper or EXCEL for the graph. (I [Current] should be in Amps not in mA)

8. What is the slope of the graph using the EXCEL features or by calculating it as raise/run. How is the slope compare with the value or R?

9. A circuit has battery of 2.5V and a current of 0.5A. What is resistance of the circuit ?

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