Advertisements
Advertisements
प्रश्न
Complete the following sentence:
A fuse is connected in ........... with the ......... wire.
Advertisements
उत्तर
A fuse is connected in series with the live wire.
APPEARS IN
संबंधित प्रश्न
Why should the resistance of:
a voltmeter be very large?
What is the conventional direction of the flow of electric current? How does it differ from the direction of flow electrons?
Calculate the effective resistance between the points A and B in the network shown below in Figure 8.45
A 720 W heater operates from a 220 V line voltage. Calculate:
(a) The electrical energy consumed by the heater in 3 h.
(b) The cost of electrical energy consumption at the rate of 60 paise per kWh.
An electric kettle has a heating element which is rated at 2 kW when connected to a 250 V electric supply. Calculate the
(a) Current which flows in the element when it is connected to a 250 V supply,
(b) Resistance of the filament,
(c) Heat produced in 1 minute by the element,
(d) Cost of running the kettle for 10 minutes a day for 30 days of the month, at the rate of Rs. 3.00 per unit.
Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.
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?
Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate :
The total current taken from the supply
An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
