Why the value of α is always less than unity?

The alpha value is obtained by calculating the ratio between the change in the collector current and the change in the emitter current. The value of this ratio turns to be less than unity when the base current in a circuit reduces to zero.

Why α is less than 1 and β is more than 1 in BJT?

α is always less that 1.0 because of carrier generation and recombination going through the base region of the transistor, thus, the base and collector current are always less than the emitter current.

Why beta is greater than alpha in transistor?

For a transistor value of $\alpha $ will be always less than 1, because then collector current is always less than emitter current. Again, the value of $\beta $ is always greater than 1, because the value of collector current is always greater than base current.

Which parameter is always less than unity?

As the emitter current for a common emitter configuration is defined as Ie = Ic + Ib, the ratio of Ic/Ie is called Alpha, given the Greek symbol of α. Note: that the value of Alpha will always be less than unity.

Why is alpha less than 1?

The alpha figure for a stock is represented as a single number, like 3 or -5. However, the number actually indicates the percentage above or below a benchmark index that the stock or fund price achieved. An alpha of -1.0 means the investment underperformed its benchmark index by 1\%. …

What is the relation between alpha and beta in transistor?

β=1−α Complete step-by-step answer: Alpha of a transistor is defined as the current gain in the common base configuration which is in turn defined as the ratio of change in the collector current to change in the emitter current.

What is relation between α and β?

β=1−α

What is the difference between alpha and beta in a transistor?

Alpha of a transistor is the current gain in common base configuration defined as the ratio of change in collector current to change in emitter current while beta is the current gain in CE configuration.

What are alpha and beta parameters for a transistor obtain relation between them?

A transistor ‘s alpha is the current gain defined as the ratio of change in collector current to change in emitter current in the common base configuration, while beta is the current gain in the \[{\text{CE}}\] configuration. It is defined as a change in the current of the collector to the current of the base.

Is a high or low alpha better?

Defining Alpha Alpha is also a measure of risk. An alpha of -15 means the investment was far too risky given the return. An alpha of zero suggests that an asset has earned a return commensurate with the risk. Alpha of greater than zero means an investment outperformed, after adjusting for volatility.

What does a negative alpha value mean?

A positive alpha indicates the security is outperforming the market. Conversely, a negative alpha indicates the security fails to generate returns at the same rate as the broader sector. So, according to this definition, a stock with a negative alpha is underperforming.

What is the difference between alpha and beta in transistor?

Alpha of a transistor is the current gain in common base configuration defined as the ratio of change in collector current to change in emitter current while beta is the current gain in CE configuration. It is defined as the change in collector current to base current.

Why is the alpha value of a base current less than unity?

Since base is thinly doped, base current is very small of the order of micro amperes. collector current is almost same as emitter current. Hence ratio of collector to emitter current is less than unity always. So alpha is less than unity. It’s value lies between 0.9 to 0.995. The 4 Worst Blood Pressure Drugs.

What is the alpha value of a transistor?

Hence ratio of collector to emitter current is less than unity always. So alpha is less than unity. It’s value lies between 0.9 to 0.995. The 4 Worst Blood Pressure Drugs. Why some doctors in the know no longer prescribe blood pressure drugs. What is the beta value of a transistor?

Why is the ratio of collector to emitter current less than unity?

In a transitor, emitter current is equal to the sum of base and collector current. Since base is thinly doped, base current is very small of the order of micro amperes. collector current is almost same as emitter current. Hence ratio of collector to emitter current is less than unity always.

What is the relationship between base and collector current in transistors?

Since the electrical relationship between these three currents, Ib, Ic and Ie is determined by the physical construction of the transistor itself, any small change in the base current (Ib), will result in a much larger change in the collector current (Ic).