As voltage increases at a fixed resistance, current also increases in a directly proportional relationship. The graph would show a linear increase in current as voltage rises. Current and voltage have a directly proportional relationship, as doubling one quantity doubles the other at a fixed resistance. When voltage is held constant and resistance increases, current decreases in an inversely proportional relationship, as halving the resistance doubles the current.
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Table of ohm's law
1. TABLE A: Comparative values of voltage and current at fixed resistance
Quantities
Current ( I )
Voltage( V )
Resistance ( R )
reading
1
A
1.5 V
15 Ω
reading
2
A
3 V
15 Ω
reading
3
A
4.5 V
15 Ω
reading
4
A
6 V
15 Ω
1.What happens to current as the voltage increases?
2.How do you describe the graph? What does it indicate?
3.How do you describe the relationship between current and voltage?
TABLE B: Comparative values of current and resistance at fixed voltage
Quantities
Current ( I )
Voltage ( V )
Resistance ( R )
reading
1
0.6 A
6V
Ω
reading
2
0.3 A
6V
Ω
reading
3
0.2 A
6V
Ω
1.Describe the values of resistance in each reading.
2.What quantity seems to affect resistance?
3.Describe the graph. What relationship exist in table B.?
reading
4
0.15 A
6V
Ω