how to modify a experiment so as to verify ohms law using a fixed DC voltage source of 8.0V?

Answer 1

all you need are 5 things to conduct this experiment:

1) a circuit board
2) a voltage source
3) a milliamp meter
4) a resistor
5) Multi-meter

connect the volatge source, resistor, and milliamp meter in series on the circuit board. Setting the voltage source to 8.0 V, you can see how much current is flowing into the circuit using the milli-amp meter. First, you should see if there is any internal resistance within the milli-amp meter (it is an inherent property of any electrical device). Use the multi-meter to determine this

Using Ohm's Law, you get V =I*(R + R_internal)

If this equation holds up for your circuit parameters, then Ohm's Law is verified.

Hope this helps

Answer 2

Use a precision resister and mili amp meter.
E=IR