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Ein Transistor wird wie in der unten dargestellten Schaltung als Schalter verwendet. Wie groß ist der notwendige Widerstand R_B wenn die Versorgungsspannung U_s=5V, der Spannungsabfall an der LED 2,2V, der Strom der Diode I_D = 10mA, der Verstärkungsfaktor beta = 200 und U_CE = 0.2 V angenommen werden? /A transistor is used as a switch as shown in the circuit below. What is the required resistance R_B if the supply voltage U_s = 5V, the voltage drop at the LED 2.2V, the current of the diode I_D = 10mA, the amplification factor beta = 200 and U_CE = 0.2 V are assumed?
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