What current flows in the 12 ohms resistor in the circuit below:
0.50 A.
0.75 A.
1.0 A.
0.25 A.
A galvanometer has a coil with a resistance of 24.0 Ohms. A current of 180 mA causes full-scale deflection. If the galvanometer is to be used to construct an ammeter that deflects full scale for 10.0 A, what shunt resistor is required?
432 µ Ohms.
423 µ Ohms.
342 µ Ohms.
234 µ Ohms.
Which of the following methods of power losses a transformer corresponds to the method of minimising it?
Power loss due to: Eddy currents;
Minimised by: Laminating the transformer core.
Power loss due to: Continuous magnetisation and demagnetization of core.
Minimised by: Using thick wire.
Power loss due to: Heating of wires;
Minimised by: Wrapping the primary coil round the secondary.
Power loss due to: Poor flux linkage;
Minimised by: Using thick copper wires.
