Objectives:
1. For the student to verify Ohm’s Law by calculating, and then by measuring voltage, current and resistance, and then
comparing the calculated and measured results.
2. For the student to verify Ohm’s Law relationships by increasing one quantity while holding the second quantity
constant, then measuring and calculating the effect on the third quantity.
Equipment Required
• Meters: Milliammeter
• Power Supply
• Resistors: one of each size - 3.6 kW, 6.8 kW, 9.1 kW
Information:
The three forms of Ohm’s Law are: I =E/R
, E = IR and R =E/I
The procedures in this experiment will have the student verify these formulas by comparing measured data with
calculated data. Allow for a reasonable tolerance in your data. For example: Measured voltage = 15 V; calculated voltage
= 14.8 V. To compare these, we use [(measured - calculated)/calculated]*100%:
Due to the accuracy of the measurement instruments (digital voltmeter, digital ohmmeter about ±1%; analog ammeter
about ±3%), measurements in the DC laboratory that agree within ±5% may be considered equal for most practical
purposes.
1. For the student to verify Ohm’s Law by calculating, and then by measuring voltage, current and resistance, and then
comparing the calculated and measured results.
2. For the student to verify Ohm’s Law relationships by increasing one quantity while holding the second quantity
constant, then measuring and calculating the effect on the third quantity.
Equipment Required
• Meters: Milliammeter
• Power Supply
• Resistors: one of each size - 3.6 kW, 6.8 kW, 9.1 kW
Information:
The three forms of Ohm’s Law are: I =E/R
, E = IR and R =E/I
The procedures in this experiment will have the student verify these formulas by comparing measured data with
calculated data. Allow for a reasonable tolerance in your data. For example: Measured voltage = 15 V; calculated voltage
= 14.8 V. To compare these, we use [(measured - calculated)/calculated]*100%:
Due to the accuracy of the measurement instruments (digital voltmeter, digital ohmmeter about ±1%; analog ammeter
about ±3%), measurements in the DC laboratory that agree within ±5% may be considered equal for most practical
purposes.
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