Advertisements
Advertisements
प्रश्न
What is meant by "electric power"?
Advertisements
उत्तर
The energy required per unit of time is called electrical power.
संबंधित प्रश्न
What is consumed using different electrical appliances, for which electricity bills are paid?
An electric lamp is labelled 12 V, 36 W. This indicates that it should be used with a 12 V supply. What other information does the label provide?
The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter,. The voltmeter reading 3 V and the ammeter reading is 0.5 A.
What is the resistance of the lamp?
What is the power of the lamp?
How many joules are there in one kilowatt-hour?
How much energy does a 100 W electric bulb transfer in 1 minute?
(a) 100 J
(b) 600 J
(c) 3600 J
(d) 6000 J
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
An electric heater of resistance 8 Ω takes a current of 15 A from the mains supply line. Calculate the rate at which heat is developed in the heater.
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions, respectively.
Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?
What are the two main systems of wiring commonly used in houses? Which of these systems mentioned by you is better and why?
Name a metal that is used as an electron emitter. Give one reason for using this metal.
State relative advantages and disadvantages of ring system of wiring over the tree system.
With reference to the diagram shown below calculate:
(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
(iii) The electrical power between P and Q.
A family uses a light bulb of 100W, a fan of 100W, and a heater of 1000W, each for 8 hours a day. If the cost of electricity is Rs. 2 per unit, what is the expenditure to the family per day, on electricity?
Out of the three fuses with current ratings 5A, 10A, 15A, which one is to be connected in a geyser circuit marked 3 kW, 220V? Give reason for your answer.
The unit of e.m.f. of a cell is ____________.
