Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: Figure 20.8 shows the schematic for a simple circuit. A simple circuit has a single voltage source and a single resistor. The wires connecting the voltage source to the resistor can be assumed to have negligible resistance, or their resistance can be included in R . Answer: simple circuit
Solution:
What has a single voltage source and a single resistor