Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: An electric circuit consists of at least one closed loop through which electric current can flow. Every circuit has a voltage source such as a battery and a conductor such as metal wire. A circuit may have other parts as well, such as lights and switches. In addition, a circuit may consist of one loop or two loops. Answer: 1
Output:
What is the minimum number of loops a circuit can have?