The purpose of this study was to improve students' Mental Models and Mental Modelling Ability in the context of electrical circuits by using the House Installation Model as a laboratory learning instrument. The problem-solving-based laboratory learning model was applied in this research. The research method utilized a descriptive qualitative research design with a pretest-posttest design. The research results showed that 75% of students experienced Mental Models improvement in the context of electrical circuits, with 15% reaching level 2 and 60% reaching level 3. The improvement in Mental Modelling Ability was also significant, with 80% of students experiencing improvement, 21.7% reaching a moderate level, and 58.7% reaching a high level of Mental Modelling Ability. These results suggest that problem-solving-based practice learning models can effectively improve students'  Mental Models and Mental Modelling Ability in the context of electrical circuits.
                        
                        
                        
                        
                            
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