Advertisements
Advertisements
प्रश्न
Complete the following:
1 kWh = _________ J
Advertisements
उत्तर
1 kWh = 3.6 x 106 J
संबंधित प्रश्न
What Makes an Electric Current Flow in a Wire?
What is an Ammeter? How is It Connected in a Circuit? Draw a Diagram to Illustrate Your Answer.
How many electrons are flowing per second past a point in a circuit in which there is a current of 5 amp?
Draw a circuit diagram showing two lamps, one cell and a switch connected in series.
How can you change the brightness of the lamp?
In which of the following cases more electrical energy is consumed per hour?
(i) A current of 1 ampere passed through a resistance of 300 ohms.
(ii) A current of 2 amperes passed through a resistance of 100 ohms.
For a heater rated at 4 kW and 220 V, calculate:
(a) the current,
(b) the resistance of the heater,
(c) the energy consumed in 2 hours, and
(d) the cost if 1 kWh is priced at Rs 4.60.
A wire of length 5 m has a resistance of 2.0 Ω calculate:
(a) the resistance of wire of length 1 m
(b) the equivalent resistance if two such wires each of length 2 m are joined in parallel.
(c) the resistance of 1 m length of wire of same material but of half diameter.
A wire is passed through a piece of cardboard as shown in fig .. An electric current flows vertically down the wire and then flows back up. The two sections of the write are observed to repel each other.
(a) Wi th the aid of a diagram, describe how you would plot the magnetic field lines on the card .

(b) Sketch the magnetic field patterns around both the sections of the wire. Use your sketch to explain why the two sections repel each other.
(c) The repulsive force between the two sections is small. What changes could be made to increase it?
At the time of short circuit, the electric current in the circuit ______.
An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
