A resistor will most likely be needed at the base lead of a transistor if the transistor will be used as a switch. The formla below is a special formula that is used only if the supply voltage is the same as the voltage being applied to the base lead of the transistor
Resistance = LoadCurrent x LoadResistance x Hfe(transistor rated)
Example:
R = .2 amps x 25 ohms x 200
= 1000 ohms or 1k
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