15. Ampere is a unit of what electrical quantity? A. current B. load C. resistance D. voltage 16. Which of the following is usually connected in series circuit? A. christmas lights B. appliances at home C. light bulbs at home D. headlight of motorcycle 17. Which of the following best describes a parallel circuit? A. Current flows along one pathway. B. Current flows along more than one pathways. C. The flow of current comes from several sources. D. The flow of current comes from more than one load. 18. What do you call a series of logical steps that is followed in order to solve a problem? A. Model method B. Scientific theory​