The main reason why A.C. is transmitted at very high voltage and low current is that it
flows faster thorough the conductor
can be stepped down
is cheaper to generate
reduces heat loss
In the series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30 V and 40 V respectively. what is the voltage of across the capacitor?
30 V
70 V
50 V
40 V
Which of the following factors does not increase the rate of evaporation of water in a lake?
Increase in the pressure of the atmosphere
Rise in temperature
Increase in the surface
Increase in the speed of wind
The opposition offered to an alternating current in a C-R series circuit is known as
impedance
resistance
reactance
friction
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