Name 2 types of cores used in current transformers and state one use for each type of core

1. Toroidal core: Toroidal cores are commonly used in current transformers for accurate measurement of current without any magnetic field leakage. They are also used in high voltage applications where precision is critical.

2. Split core: Split cores are used in current transformers for easy installation and retrofitting. They can be opened and closed around a conductor without the need to disconnect it, making them ideal for applications where space is limited or where the conductor cannot be easily removed.