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 |