MODULE V
Electrical engineering - Basics Page 17

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2.4 Exercises

  1. A copper cable is 20m long and has a cross section of 4mm2. Determine the conductor resistance at a temperature of 20C.

  2. The conductor resistance of an aluminium cable that has a cross section of 2,5mm2 should maximally be 2,8 at a temperature of 20C. Calculate the maximum cable length in millimetres.

  3. Determine the resistivity of an electric resistor that is 2cm long and has a cross section of 4mm2 and a resistance of 10.

  4. The voltage in an electric circuit is 50V. Two resistors are connected in parallel:
    R1 = 5 and R2 = 20. Calculate:
    a) The partial currents I1 and I2
    b) The total amperage I
    c) The substitute resistance R

  5. In an electric storage heater three equal heating resistors (5kW each) have been installed.
    Determine:
    a) The amperages I1, I2, I3 and I
    b) The resistance R1, R2 and R3
    c) The total substitute resistance R


 

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