The correct answer is: A. more than 1.
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor’s terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.
The value of a of a transistor is the ratio of the collector current to the base current. It is a measure of how much the collector current is amplified by the transistor. The value of a is typically greater than 1, which means that the collector current is greater than the base current. This is because the transistor acts as an amplifier, and it takes a small amount of current at the base to control a larger amount of current at the collector.
Option B is incorrect because the value of a is typically greater than 1. Option C is incorrect because the value of a is not always equal to 1. Option D is incorrect because the value of a is not none of the above.