What voltage should the voltmeter indicate when you turn on the battery?
Show the correct answer
Correct answer
C. Greater than the value specified for the given type of tram.
Explanation
The question is about checking the voltage of the battery before leaving. After the battery is switched on, the voltmeter should show a voltage higher than the value specified for the given type of tram - answer C.
The battery powers the low-voltage circuits, including the controls, the lighting, the doors and the track brakes. The manufacturer of each type of tram specifies the minimum voltage at which this equipment works reliably. A voltage lower than this value (answer B) means a flat or damaged battery and may end in a breakdown while driving. A single value of 38 V (answer A) does not fit all trams, because different types have different electrical systems. When the voltage is too low, you report it to the technical service before leaving.
Legal basis: Art. 66 para. 1 point 1 and Art. 3 para. 1 of the Road Traffic Act (Prawo o ruchu drogowym)