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प्रश्न
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उत्तर
A switch is an on-off device for current in a circuit (or in an appliance). Its main function is either to connect or to disconnect an electrical appliance in an electric circuit.
Switches are always connected in the live wire of circuits so that when a switch is in 'off' position, no current flows through the appliance and its live and neutral wires are at same potential and it is safe to touch the live wire leading to the appliance, even when the fuse is blown.
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संबंधित प्रश्न
(a) With the help of a circuit diagram, obtain the relation for the equivalent resistance of two resistances connected in parallel.
(b) In the circuit diagram shown below, find:
(i) Total resistance.
(ii) Current shown by the ammeter A
How does the heat H produced by a current passing through a fixed resistance wire depend on magnitude of current I?
Which effect of current is utilised in an electric light bulb?
Find the effective resistance in the following circuit diagrams (Fig.):
Tick (✓) the correct choice among the following :
Which of the following changes would enable a millimeter to be used as a
direct current ammeter reading upto 1 A?
Define an electric current.
State whether true or false. If false, correct the statement.
Current can produce magnetic field.
