Electrotechnology

Question 1: A battery is charged with a linear function k = -0.05
m = 1.3
How long does it take to charge a 7Ah battery? Given that the battery is empty from start.

2nd
a) From the diagram below:
Calculate U1 and U2.
b) Calculate the potential of point P.

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3:Calculate the replacement resistance between A and B from the figure below if: R1 = 40Ω, R2 = 30Ω, R3 = 20Ω, R4 = 30Ω, R5 = 60Ω, R6 = 50Ω

4. Calculate R so that the voltage U across the capacitors follows the charging curve below.
C1 = 100µF, C2 = 220µF R =? Ω

5. With the help of a transformer, diode (s) and resistor different electrical signals can be created:
a) Draw a diagram using the components above that create a half-wave signal. see signal below. Put out polarity
b) Draw a diagram using the components above that create a full-wave signal. see signal below. Put out polarity

6. What will be the power output in a copper conductor if the diameter is 2mm, the current is 0.5A and the length is 2500 mm

7. R1 = 5 Ω (the resistor symbol for resistors looks a bit different in the diagram below) R2 = 15 Ω
R3 = 10 Ω
R4 = 40 Ω
R5 = 2 Ω
E = 12V
a) Calculate the current through R4. b) Calculate the voltage over R1.

8.hFe = 300 R1 =? Ω R2 =? Ω
a) Calculate the resistances to R1 and R2 (see diagram below) so that the transistor’s working point ends as shown in the figure below.
b) Calculate the power loss in the transistor

9.
a) Calculate the potential of point P. b) Calculate I3.
R1 = 20Ω R2 = 10Ω R3 = 100Ω

10. ….

11. A series connection of two components generates the following impedance triangle.
a. What are the components? (motivate)
b. Does the angle increase or decrease if the frequency decreases? (motivate)

12….

13. The image below is a schematic illustration of a DC motor. Which direction will the motor rotate? (motivate)

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