Look at the datasheet for the specific transistor you are using, you need to know the gain of the transistor. If you have a gain of 100 for example, and you give 10mA to the base - you'll get 1A across the collector and emitter.
Look at the datasheet for the specific transistor you are using, you need to know the gain of the transistor. If you have a gain of 100 for example, and you give 10mA to the base - you'll get 1A across the collector and emitter.