# If base current is 100µA and current gain is 100, then collector current is?

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#### ashokbly

##### Newbie
If base current is 100µA and current gain is 100, then collector current is?
Choose the right one?
A. 1A
B. 10A
C. 1mA
D. 10mA

IF no, I will share your answer in the next post. Good Luck!!
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In its linear region Ic = Ib * hfe. The calculation isn't difficult!

Brian

Hi,

Even if you don't know anything about electronics and BJTs the riddle can be solved:
You have
* Base current Ib = 100uA (unit: Amperes for current)
* gain= 100 (no unit)
And you want the result to be current => unit = Amperes.

Then there are just two possible mathematical operatiins:
* multiply
* divide
Because you can't add or subtract only values with identical unit.
Ampere - Ampere to get Ampere
or hours - hours to get hours

you can't subtract values with different units: you can't subtract Amperes from hours
But you can multiply and divide values woth different units: like Amperes x hours = Amperehours

Knowing this there are just two possible mathematical results ... whereas only one is in the given results to choose from.

Klaus

The gain of a transistor is a fairly wide range and changes when the collector current and temperature are changed.

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