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Table. 7.

Pre-service teachers’ (PSTs’) difficulties about power supply voltage.

Item Difficulties Number
7 The photocurrent needs to be added to the current by the voltage of the power supply. 5
7 As the voltage of the power supply increases, the number of electrons accumulated on the metal plate increases. 6
14 The photocurrent needs to be added to the current by the voltage of the power supply. 4
14 No current flows in the circuit if the power supply voltage is not supplied. 3
14 PST doesn't know the difference between connecting the power supply in the forward and reverse directions. 1
New Phys.: Sae Mulli 2022;72:841~856 https://doi.org/10.3938/NPSM.72.841
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