Question

Measuring Current as a Function of Voltage
A 3 column table with 5 rows labeled table A. The first column is labeled voltage in volts with entries 1.0, 5.0, 10, 20, 50. The second column is labeled current: calculated in amps with no entries. The last column is labeled current: experimental in amps.
According to Ohm’s law, determine the experimental current for these values in Table A.

voltage = 5 V, resistance = 20 Ω:
0.02
A

voltage = 20 V, resistance = 20 Ω:
0.10
A

voltage = 50 V, resistance = 20 Ω:

Answer 1

Use Ohm’s law I = V / R with R = 20 Ω.

- 1.0 V: I = 1.0 / 20 = 0.05 A
- 5.0 V: I = 5.0 / 20 = 0.25 A
- 10 V: I = 10 / 20 = 0.50 A
- 20 V: I = 20 / 20 = 1.00 A
- 50 V: I = 50 / 20 = 2.50 A

Note: the values you wrote (0.02 A for 5 V and 0.10 A for 20 V) do not match Ohm’s law with R = 20 Ω.