The correct answer is: A. IC = IE + IB
In a transistor, the collector current (IC) is equal to the emitter current (IE) plus the base current (IB). This is known as the transistor’s current gain, and it is a measure of how much the transistor amplifies the input current.
The base current is the current that flows into the base of the transistor. This current is very small, but it controls the much larger collector current. The collector current is the current that flows out of the collector of the transistor.
The emitter current is the sum of the collector current and the base current. This means that the emitter current is always greater than the collector current.
The transistor’s current gain is a very important parameter, and it is used to design and analyze transistor circuits. The current gain of a transistor can be increased by increasing the size of the transistor or by using a different type of transistor.
Option B is incorrect because the base current is not equal to the collector current plus the emitter current. The base current is much smaller than the collector current.
Option C is incorrect because the emitter current is not equal to the collector current minus the base current. The emitter current is always greater than the collector current.
Option D is incorrect because the emitter current is not equal to the collector current plus the base current. The emitter current is always greater than the collector current.