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- 6. (a)Use voltage division to determine the voltage vo across the 400resistor. (b)Use ve from part (a) to determine the current through the 4002resistor, and use this voltage and current division to calculate the current in the 3002resistor. 60 V 400 www +% Dov 200 70 (2 www 30023 5002 w 1002A40 resistor is connected in series with the parallel assembly of3 Q and 6 Qresistors. The current through the 42 resistor is 6 A. What is the current through the 30 resistor?A new material is found to be superconducting below 77 K. How much resistance will a 75 mm long sample of this material have if it is at a temperature of 69.3 K while connected to a 6.4 V AC-power supply? R = How much thermal energy will it generate?Thermal energy generated =
- A copper wire is 10 cm long and has a cross-sectional area of 0.4 mm^2 and the resistance of the wire is 0.4 ohms. The wire is connected to a source with a voltage of 10 v, what is the movement, knowing that the density of conduction electrons for copper is 8.5 x 10^28 m^-3 8.5 x 10^4 63-5 For the same wire in the previous question, what is the fersi level if the atomic weight of copper is 0.5 x 10^(-5) 0.94 x 10^(-4) 7.03| ev 0.36 x 10^(-4) 7.01eV 7.05 eV 7.021 evReal resistors can only be manufactured to a specific tolerance, so that in effect the value of the resistance is uncertain. For example, a 1 Ohm resistor specified as 5% tolerance could in practice be found to have a value anywhere in the range of 0.95 to 1.05 Ohms. ut of Calculate the range of the voltage across a 5.4 kOhms 7% tolerance resistor if the current flowing through the element is 1 A. iestion Select one: Oa. We cannot decide. O b. Any value between 5.022 V and 5.778 V Oc. 5.4 V O d. 3.3 V Oe. All answers are possible. O f. None of these answers is correct. O g. 5.778 O h. Any value between 2.97 V and 3.63 V Oi 297 V O j. 3.63 V Ok5.022 VA silicon BJT is connected as shown in the figure below with a current transfer ratio B = 150, V_ BE = 0.7 V, V_CE = 1.5 V, if the base current I_B = 30 µA, the emitter voltage V_E = 1 V, and VCC = 10 V, use circuit theories and principles to determine: Vec Re- R2. R1. Rg. Choose.. The value of the resistor R_B (k Choose... + The value of the resistor R__E (k Choose... The value of the Collector Choose... current I_C (mA). The value of the Emitter current Choose... + L_E (mA). The value of the resistor R_2 (k Choose... + N) if R_1 = 2 k %3D
- Two LEDs are connected in series with a 9V battery. To protect LEDs from over current, we areusing a current limiting resistor in series. Calculate required resistor value to have 16 mA current at LEDs. Forward voltage of each Led is 2.9 V3. For a Si bar of length 5um, doped n-type at 3x10¹ cm³, calculate the current density for an applied field of 3V across its length. Then do the same for a voltage of 3200V. You can assume that the electron and hole mobilities are 1500 and 500 cm²/V.s, respectively, in the ohmic region below 10¹V/cm and. For higher fields, both electrons and holes have a saturation velocity of 107cm/s.a) Find the resistance of a 1 cm pure silicon crystal. b) What is the resistance when the crystal is doped with arsenic if the doping is 1 in 10°, that is 1 part per billion
- (a) Explain Ohm's law and show it graphically. Does Ohm's law hold for semiconductor and with varying temperature? Give your answer with valid reasons. (b) A heating element is made by maintaining a potential difference of 75.0 V across the length of a Nichrome wire that has a 2.60 x 10“ m? cross section. Nichrome has a resistivity of 5.00 x 107 Q'm. (1) If the element dissipates 5000 W, what is its length? (II) If a potential difference of 100 V is used to obtain the same dissipation rate, what should the length be?Do you think the resistor you measured are generally within tolerance? What evidence support your answer ?Silicon is a semiconducting metal with a resistivity of 640 Q. m. HINT (a) Determine the current per unit area through a 4.62 V silicon junction with a length of 2.44 mm. (Enter your answer in A/m².) A/m² (b) Find the current (in A) through the junction if its cross-sectional area is 1.75 x 10-5 m². A