Question

Please use the graphs to answer the following questions.

Question 1.1) The forward current/voltage curve of the LED is shown on the figures. What is the forward current I_F when the forward voltage V_F is 1.5V? (Hint-See Figure 1. (a) 4points

Question 1.2) How much forward current you need to double the radiant intensity from the radiant intensity at 100 mA forward current. (choose the closest number) (Hint - See Figure 1 (b) 4points)

Question 1.3) What is the forward voltage you need to run for the same condition in problem (b) (Hint- See Figure 1 (a) 4 points

Please show a step by step on how to solve for these 3 problems and draw lines to indicate on the graphs on how you got the answer. Please write large and clearly so I can read it! Thanks

The following graphs shows the properties of a LED. Please answer the following questions. Forward Current いfy,), single puise,い100㎛ T.-25 Cl, Radiant Intensity Permissible Pulse Handling Capatīty い$(Qi T^ . 25 "C duty cycle D 2100 mA),t('), s ngle pulse い25㎛ parameter 10 1 0 t0 Ds 005 0.02 0 05 10 10 0.2 0.4 10 10 02 103 0.5 1 15 2 25 V3 10 10 10 mA 10 10 10 10 10 10 10 10' 10 Figure 1 1.1 The forward current/voltage curve of the LED is shown on the fight figure. What is the forward current I when the forward voltage Vr is 1.5V? (Hint-See Fig 1. (a)-4 pt) ①1mA 2 10 mA ③ 100mA ④500mA 1.2 How much forward current you need to double the radiant intensity from the radiant intensity at 100 mA forward current. (choose the closest number) (Hint-See Fig 1. (b)-4 pt) ①50mA 2 225 mA ③ 550mA ④ 1000mA 1.3 What is the forward voltage you need to run for the same condition in problem (b). (Hint- See Fig 1. (a) -4 pt) ①1.5v ② 1.7V ④2.3V

Answer 1

1.1 from the graph as we can see for Vf = 1.5V forward current will be If = 10^-1 A = 100 mA (option 3)

1.2 at 100mA radiant intensity is 10^0 = 1, To double it, current needed will be 225mA (approx)     (option 2)

1.3 forward voltage needed for this will be = 1.7V (option 2)