ASVAB Electronics Information Practice Test 381842

Question 1 of 5
Battery Configurations

Batteries can be connected together in various combinations to increase their total voltage and/or total current. Connecting batteries in series combines their voltage while keeping their current the same, connecting batteries in parallel combines their current while keeping their voltage the same, and using a series-parallel configuration, half the batteries can be connected in series and half in parallel to combine both voltage and current.

How would you connect 4 [9V 15A] batteries to achieve a combined power output of 18V 30A?
perpendicular
series
orthogonal
series-parallel