Toroidal transformers are widely used in household equipment & other high technical electronic equipment, here let’s discuss about the basic parameter of the toroidal transformer:

1. Rated power: refers to the maximum load power of the transformer when it is working. It is the output power that the transformer will work for a long time under the specified frequency and voltage without exceeding the specified temperature rise.

2. Rated voltage: refers to the voltage allowed to be applied to the coil of the transformer, which shall not be greater than the specified value during operation.

3. Voltage ratio: refers to the ratio of the primary voltage to the secondary voltage of the transformer（Toroidal Output Transformer）. There is a difference between the no-load voltage ratio and the load voltage ratio. No-load refers to the state when the transformer is not connected to any electrical appliances, and the load refers to the transformer connected to the electrical appliances when it is energized. In the state of use, the no-load voltage will be greater than the load voltage.

4. Operating frequency: Transformer core loss has a great relationship with frequency, so it should be designed and used according to the operating frequency. This frequency is called operating frequency. The general working frequency is between 50HZ~60HZ.

5. Efficiency: refers to the percentage of the ratio of secondary power to primary power. Generally, the higher the rated power of the transformer, the higher the efficiency. (Of course the efficiency of the transformer is also related to the material and technology of the transformer).

6. No-load current: When the secondary of the transformer is open, there is still a certain current in the primary. This part of the current is called the no-load current. The no-load current is caused by the magnetizing current (generating magnetic flux) and iron loss current (caused by iron core loss) Composition, for a 50Hz power transformer, the no-load current is basically equal to the magnetizing current.

7. No-load loss: refers to the power loss measured on the primary when the secondary of the power transformer is open. The main loss is the core loss, by the loss (copper loss) caused by the no-load current on the copper resistance of the primary coil. The loss is small. we are professional electrical power transformer and transformer core manufacturer,get more details from https://www.coilcore.com/