Advertisements
Advertisements
प्रश्न
What changes in energy occur in an electric bulb?
Advertisements
उत्तर
In an electric bulb, electrical energy changes to heat and light energy.
संबंधित प्रश्न
In a house two 60 W electric bulbs are lighted for 4 hours, and three 100 W bulbs for 5 hours everyday. Calculate the electric consumed in 30 days.
Calculate the cost of operating a heater of 500 W for 20 hours at the rate of Rs 3.90 per unit.
When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 × 104 J of heat are produced. Calculate
the power of the resistor.
the voltage across the resistor.
Define 1 kilowatt hour.
What is wrong with the circuit diagram (Fig. 34)? Carefully check the symbols and assign proper positive and negative signs to them.
State the position of heating element with respect to principal focus of concave reflector and give reason for choosing this position.
Find the heat produced in joules when a current of 10 amperes flows through a connecting wire of resistance 2 × 10-2 ohms and heating element of resistance 250 ohms for 2 seconds.
