Instruction manual

10
Basic Electricity 012-04367E
Resistance, Ω Current, amp Voltage, volt Voltage/Resistance
Table 3.1
1st Digit
2nd Digit
No. of Zeros
Tolerance
0
1
2
3
4
5
6
7
8
9
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
White
None
Silver
Gold
Red
±20%
±10%
±5%
±2%
Fourth Band
Figure 3.2
Data Processing
➀ Construct a graph of Current (vertical axis) vs Resistance.
➁ For each of your sets of data, calculate the ratio of Voltage/Resistance. Compare the values
you calculate with the measured values of the current.
Discussion
➀ From your graph, what is the mathematical relationship between Current and Resistance?
➁ Ohm’s Law states that current is given by the ratio of voltage/resistance. Does your data
concur with this?
➂ What were possible sources of experimental error in this lab? Would you expect each to
make your results larger or to make them smaller?
Reference