are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators______________?
A. Varistors
B. Thermistor
C. Semi-conductors
D. Variable resistors
The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
A. 18 Q
B. 36 Q
C. 48 Q
D. 64 Q
When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is___________?
A. 1 n-mho
B. 106 mho
C. 1 milli-mho
D. none of the above
The number of electrons in the outer most orbit of carbon atom is___________?
A. 3
B. 4
C. 6
D. 7
The filament of an electric bulb is made of______________?
A. carbon
B. aluminium
C. tungsten
D. nickel
74. Sparking occurs when a load is switched off because the circuit has high_________?
A. resistance
B. inductance
C. capacitance
D. impedance
Bulbs in street lighting are all connected in_____________?
A. parallel
B. series
C. series-parallel
D. end-to-end