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Electrical Power and Household Circuits
For a fuse, higher the current rating ….. is the fuse wire.
thicker
i) Name the device used to increase the voltage at a generating station.
ii) At what frequency is A.C. supplied to residential houses?
iii) Name the wire in a household electrical circuit to which the switch is connected.
i) Transformer [ step up transformer]
ii) 50 Hz
iii) Live wire
i) Name the devices used to protect the electric circuits from overloading and short circuits.
ii) On what effect of electricity does the above device work?
i) Electric fuse is used to protect the electric circuits from overloading and short circuits.
ii) Electric fuse works on the principle of Heating effect of electrical current.
i) An electrical gadget can give an electric shock to it’s user under certain circumstances. Mention any two of these circumstances.
ii) What preventive measure provided in a gadget can protect a person from an electric shock?
i) An electrical gadget can give an electric shock to it’s user under certain circumstances. Mention any two of these circumstances.
ii) What preventive measure provided in a gadget can protect a person from an electric shock?
i) The two circumstances are as follows:
1. An electric shock may be caused either due to poor insulation of wires.
2. When the electric appliances are touched with wet hands.
ii) As preventive measures, the insulation of wires must be of good quality and it should be checked from time to time particularly, when they become old, so that no wire is left naked.
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Mock Test Series
Mock Test Series