Engine 2014: Electricity

1. A Lamp L would be dark due to balanced voltages across the transformer secondaries
2. B Lamp L would be bright due to unbalanced voltages across the transformer secondaries
3. C Lamp L would be dark due to unbalanced voltages across the transformer secondaries
4. D Lamp L would be bright due to balanced voltages across the transformer secondaries

Tip: press A-D to answer