Final answer:
The phase angles determined from oscilloscope measurements can differ from the values determined from the X1 and R calculations due to factors like measurement errors, impedance variations, and frequency dependence of reactances.
Step-by-step explanation:
The phase angles determined from oscilloscope measurements can differ from the values determined from the X1 and R calculations due to several factors. One possible reason for the discrepancies is the presence of measurement errors in the oscilloscope readings. Additionally, the phase angles obtained from calculations assume ideal conditions and may not account for real-world factors such as impedance variations or non-ideal components. Another factor to consider is the frequency dependence of reactances, which can introduce phase shifts between the current and voltage in the circuit.