Question

Determining 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 calculated current for these values in Table A.

voltage = 5 V, resistance = 20 Ω:
0.25
A

voltage = 20 V, resistance = 20 Ω:
1.0
A

voltage = 50 V, resistance = 20 Ω:
2.5
A

Answer 1

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

Calculated currents:
- 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

You can fill these into the “calculated current” column of Table A; leave the experimental column for measured values.