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What is the order of current drawn by appliances connected to the ‘power circuit’ of a household?
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Give two precautious that you would take while putting off an electric switch.
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What is the function of the split rings in a d.c. motor?
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Why is the electric power from the generating station transmitted at high voltage?
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How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
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How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
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How does the heat produced by die passage of current in a metallic wire depend on the time of passage of current in the wire?
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What do you understand by ‘earthing’? What are the advantages of earthing in a household electric circuit? Explain, how it is done?
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State relative advantages and disadvantages of ring system of wiring over the tree system.
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An electric heater is rated 220 V, 550 W. What does this statement mean?
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An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
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An electric heater is rated 220 V, 550 W. Electrical energy is also measured in kWh. What do you understand by a kilo-watt-hour?
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State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
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How does earthing prevent electrical shock?
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You are required to connect a bulb, a fan and a socket outlet to the mains in one set A and an air-conditioner and a refrigerator to the mains in other set B. Will you recommend the wire of same thickness and same insulation in both? explain your answer.
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At what voltage is the electric power generated at the generating station? Explain the transmission of this power to your house.
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How is the amount of heat produced calculated due to the passage of current in a metallic conductor? Derive an expression for it.
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Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.
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Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the resistance of each heater.
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Three 250 W heaters are connected in parallel to a 100 V supply, Calculate the energy supply in kWh to the three heaters in 5 hour.
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