Question

Suppose you were to build this circuit and take measurements of current through the
resistor and voltage across the resistor:

Recording these numerical values in a table, the results look something like this:
Current Voltage
0.22 A 0.66 V
0.47 A 1.42 V
0.85 A 2.54 V
1.05 A 3.16 V
1.50 A 4.51 V
1.80 A 5.41 V
Plot these figures on the graph. What mathematical relationship do you see between voltage and current
in this simple circuit?

Answer 1

Answer:

Hey mate

From the table, we can see that approximately the same value for V/I is obtained in each case. Thus the V-I graph is a straight line that passes through the origin of the graph. Thus V/I is a constant ratio.

The potential difference V, across the metallic wire in an elec. circuit is directly proprtional to the current flowing thru' it, provided its temp. remains the same. This is called Ohm's law -

V/I = Constant

constant = R

V = IR

REFER textbook PG. 204

Explanation:

hope this helps you

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