An electric heater kept in vacuum is heated continuously by passing electric current. Its temperature
An electric heater kept in vacuum is heated continuously by passing electric current. Its temperature
- A
Will go on rising with time
- B
Will stop after sometime as it will loose heat to the surroundings by conduction
- C
Will rise for sometime and there after will start falling
- D
Will become constant after sometime because of loss of heat due to radiation
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The energy consumed in $1\, Kwatt$ electric heater in $30$ seconds will be
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For ensuring dissipation of same energy in all three resistors $({R_1},\,{R_2},\,{R_3})$ connected as shown in figure, their values must be related as
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A cable of resistance $10\,\Omega $ carries electric power from a generator producing $250\, kW$ at $10000\, volt$, the power lost in the cable during transmission is ............. $kW$
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Assertion : Long distance power transmission is done at high voltage.
Reason : At high voltage supply power losses are less.
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Reason : At high voltage supply power losses are less.
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