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प्रश्न
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संबंधित प्रश्न
Explain why, filament type electric bulbs are not power efficient.
What is wrong with the circuit diagram (Fig. 34)? Carefully check the symbols and assign proper positive and negative signs to them.
What does the unit kilowatt hour measure? Define it.
State the position of heating element with respect to principal focus of concave reflector and give reason for choosing this position.
Why is the electric power from the generating station transmitted at high voltage?
How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
An electric bulb is rated as 100W – 250V. What information does it convey? Calculate the current through the filament of the bulb.
A battery of e.m.f. 12V and internal resistance 1.6 Ω is connected to two resistors of 4Ω and 6Ω connected in parallel. Calculate:
(i) the current drawn from the battery,
(ii) the power dissipated in each resistor,
(ii)the total power supplied by the battery.
An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. Calculate:
(i) the current drawn,
(ii) the electrical energy consumed in 60 hours,
(iii) the cost of electrical energy consumed at Rs. 2.50 per kWh.
