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Where is the main fuse in a house circuit connected?
Chapter: [8] Current Electricity
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Is kWh the unit of electrical energy?
Chapter: [8] Current Electricity
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What is the purpose of a switch in a circuit? Why is the switch put in the live wire?
Chapter: [8] Current Electricity
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A switch is not touched with wet hands while putting it on or off. Give a reason for your answer.
Chapter: [8] Current Electricity
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An electric bulb is rated 250 W, 230 V. What information does this convey? Calculate the current through a 60 W lamp rated for 250 V. If the line voltage falls to 200 V, how is the power consumed by the bulb affected?
Chapter: [8] Current Electricity
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The metal case of an electric appliance is earthed. Explain the reason.
Chapter: [8] Current Electricity
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A bulb marked 12 V, 24 W operates on a 12 volt car battery for 20 minutes. Calculate:
(i) The current flowing through it, and
(ii) The energy liberated.
Chapter: [8] Current Electricity
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What is international convention of colour coding in a cable?
Chapter: [8] Current Electricity
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What should be the current rating of a fuse to be used with an electric appliance of rating 1.5 kW-220 V? How is the fuse connected with the appliance?
Chapter: [8] Current Electricity
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Explain briefly how a fuse protects an electric circuit.
Chapter: [8] Current Electricity
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Draw a labeled diagram of a three pin socket.
Chapter: [8] Current Electricity
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Under what circumstances does one get an electric shock from an electrical gadget?
Chapter: [8] Current Electricity
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An electric bulb is rated at 220 V, 100 W. What is its resistance? What maximum current can be passed through it?
Chapter: [8] Current Electricity
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Two resistors of 4 Ω and 6 Ω are connected in parallel. The combination is
connected across a 6 volt battery of negligible resistance. Calculate:
( i) The power supplied by the battery,
(ii) The power dissipated in each resistor.
Chapter: [8] Current Electricity
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Name the unit which a consumer pays as the cost of electricity.
Chapter: [8] Current Electricity
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State the commercial unit of electrical energy.
Chapter: [8] Current Electricity
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What do you mean by 'power-voltage' rating of electrical appliances?
Chapter: [8] Current Electricity
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Name the physical quantity which equals the product of voltage and current.
Chapter: [8] Current Electricity
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The marking on an electric bulb reads; 200 V, 60 W. What does it mean?
Chapter: [8] Current Electricity
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The resistance of 100 W (220 V) bulb is greater than that of 60 W (220 V) bulb. Is it true or false?
Chapter: [8] Current Electricity
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