A copper cable is 20m
long and has a cross section of 4mm2. Determine the conductor resistance at
a temperature of 20°C.
The conductor resistance
of an aluminium cable that has a cross section of 2,5mm2 should maximally
be 2,8 at a temperature
of 20°C. Calculate the maximum cable length in millimetres.
Determine the resistivity
of an electric resistor that is 2cm long and has a cross section of 4mm2 and
a resistance of 10.
The voltage in an electric
circuit is 50V. Two resistors are connected in parallel:
R1 = 5 and R2 = 20.
a) The partial currents I1 and I2
b) The total amperage I
c) The substitute resistance R
In an electric storage
heater three equal heating resistors (5kW each) have been installed.
a) The amperages I1, I2, I3 and I
b) The resistance R1, R2 and R3
c) The total substitute resistance R