Multiple choice If four cells are joined in series, how much electricity will they produce? 1.5 V 3 V 6 V 6.5 V - Reveal answer Fill a bubble to check yourself C Correct answer Explanation This is the correct answer. If four cells are joined in series, they will produce 6 V. Each cell is 1.5 V, so 4 * 1.5 = 6 V.