The minimum charge on an ion is______________?
The minimum charge on an ion is______________?
A. equal to the atomic number of the atom
B. equal to the charge of an electron
C. equal to the charge of the number of electrons in an atom (#) zero
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In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains______________?
A. length of heating element should be decreased
B. length of heating element should be increased
C. length of heating element has no effect on heating if water
D. none of the aboveHow many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
A. 10
B. 60
C. 600
D. 12001 Ampere current means flowing of 1 Coulomb charge per second. That means 10 A current in 1 minute or 60 seconds implies 10 × 60 = 600 coulombs.
The property of a conductor due to which it passes current is called___________?
The property of a conductor due to which it passes current is called___________?
A. resistance
B. reluctance
C. conductance
D. inductanceAll of the following are equivalent to watt except_____________?
All of the following are equivalent to watt except_____________?
A. (amperes) ohm
B. joules/seC.
C. amperes x volts
D. amperes/voltWith three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
A. 10 W
B. 20 W
C. 40 W
D. 60 WIf P is the power of a star connected system then what will be power of an equivalent delta connected system?
If P is the power of a star connected system then what will be power of an equivalent delta connected system?A. P
B. 3P
C. P/3
D. None of the aboveAssume 3 numbers of pure resistive loads each of value R.
When these loads are connected in delta the power in each resistor is V^2/R and the total power is 3×V^2/R.
When these loads are connected in star the voltage applied across each = V/(sqrt of 3). Power in each load becomes = V^2/(3×R) . and the total load is =(3×V^2)/(3×R)=V^2/R. You can see this is 3 times less than the total power when the loads are connected in delta.
One important point is that the loads should withstand higher voltage (line voltage) and higher current when connected in delta than when they are connected in star
so power in delta is 3 time power correct answer is 3P