How do you determine the polarity of the voltage with circuits like the ones in questions 9 and 10?
http://www.allaboutcircuits.com/worksheets/dc_s.html
http://www.allaboutcircuits.com/worksheets/dc_s.html
But the questions are asking for the voltage across the bulb and that polarity is not given.What do you mean? The polarity is shown.
The (ideal)voltage sources guarantee that the positive terminal is X volts above the negative terminal.
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