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प्रश्न
Which effect of current is utilised in the working of an electric fuse?
उत्तर
The heating effect of current is utilised in the working of an electric fuse.
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संबंधित प्रश्न
What is an electric current?
A switch must be connected in:
(a) Live wire (b) neutral wire
(c) earth wire (d) either earth or neutral wire
Complete the following sentence:
Fuse wire has a ............ Melting point and it is made of an alloy of ......... and if the current in a circuit rises too high, the fuse wire ...........
Find the effective resistance in the following circuit diagrams (Fig.):
Fig. shows a 3 pin plug with the cover removed. The electric cable
connected to the plug contains 3 wires with colour coded insulation namely brown, blue and green.
- Identify each of the colour coded wires by stating to which of the
terminals A, B or C in the diagram they should be connected. - Identify the terminal through which no current passes in normal
circumstances. - What is the purpose of the earthed wire connected to an electric
appliance like an electric heater? Describe how it works.
Fig . shows the core of a transformer and i ts input and output connections
State the material used for the core and describe th e structure of the core.
(a) Use the values given in the diagram to calculate the turns ratio for the transformer and connections, labeling all parts of the diagram .
(b) If a current of 2 A is taken from th e output, calculate th e current in the input circuit (Assume the transformer to be ideal ).
An electric bulb is rated '100 W, 250 V'. How much current will the bulb draw if connected to a 250 V supply?
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
