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Step 1 of 3 4.009E Refer to Figure E4.9 in the textbook for the circuit. The diode in the circuit is a large high current device whose reverse leakage is reasonably independent of voltage. At T = 20°C the voltage V = At the diode is reverse biased. So the current flowing in the circuit is reverse saturation current Calculate the current in the circuit. Substitute for , 1 V for V , and 1 for R in the equation. = Thus, the reverse current at 20°C is 1 Step 2 of 3 Since the reverse current doubles for every 10°C rise in temperature, the reverse current at 30°C is, = 2 Similarly, the reverse current at 40°C is, = 4 The voltage V at 40°C is, = = =4V Therefore, the voltage V at 40°C is 4V Step 3 of 3 Since the reverse current doubles for every 10°C rise in temperature, the reverse current at 10°C is, = 2 = 0.5 Similarly, the reverse current at 0°C is, = = 2 = The voltage V at 0°C is, = = = 0.25 V Therefore, the voltage V at 0°C is 0.25 V