This apparatus helps students to observe energy transfer and conversion and investigate the systems that keep homes comfortable and safe. The suggested activities below will: explore the relationship between parallel circuits and current; understand how thermostats and circuit breakers operate; and compare the energy efficiency of LEDs to incandescent bulbs. Components: 1. 6V DC connections 2. Multimeter connections 3. Bulb sockets (5) 4. Bimetallic bar switch 5. On/off switches (5) 6. 6V incandescent bulbs (5) 7. LED bulbs (5) 8. Candle 9. Multimeter Additional Supplies Needed: • 6V DC power supply • Stopwatch