Question
State differences between nuclear fusion and nuclear fission.
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(i) An electric bulb is rated $240 V-60 W$ and is working at $100 \%$ efficiency.
(a) Calculate the resistance of the bulb.
(b) If an identical bulb is connected in series with this bulb, then :
(i) Draw the circuit diagram.
(ii) What is the rate of conversion of energy in each bulb?
(iii) Total power used by the bulbs.
(ii) A family uses 2 light bulbs of 60 W , a fan of 120 W and a heater of 750 W an average of 8 hours a day. If the cost of electricity is ₹ 3.50 per unit, what is the daily expenditure of the family in a day?
(iii) A bulb is marked $150 W-220 V$ and an electric heater is marked $1500 W-220 V$.
(a) What is the ratio of resistance of these two devices?
(b) How does power rating of a device help you to select the type of connecting wire to be used?
(c) Which of the above devices needs thicker connecting wire?
→(a) Calculate the resistance of the bulb.
(b) If an identical bulb is connected in series with this bulb, then :
(i) Draw the circuit diagram.
(ii) What is the rate of conversion of energy in each bulb?
(iii) Total power used by the bulbs.
(ii) A family uses 2 light bulbs of 60 W , a fan of 120 W and a heater of 750 W an average of 8 hours a day. If the cost of electricity is ₹ 3.50 per unit, what is the daily expenditure of the family in a day?
(iii) A bulb is marked $150 W-220 V$ and an electric heater is marked $1500 W-220 V$.
(a) What is the ratio of resistance of these two devices?
(b) How does power rating of a device help you to select the type of connecting wire to be used?
(c) Which of the above devices needs thicker connecting wire?
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(iii) (a) Derive relation between the efficiency, mechanical advantage, and the velocity ratio of a practical machine.
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