Answer: Because this is an unregulated power supply, output will vary depending on input and whether it is under load, so both are correct (depending on the input) as shown in the table below.
| Conditions |
Output Voltage |
| No load, input is 105 volts |
approximately 13 volts |
| No load, input is 120 volts |
approximately 18 volts |
| Under load, input is 105 volts |
approximately 11 to 12 volts |
| Under load, input is 120 volts |
approximately 18 volts |
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