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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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An electric bulb is rated 240V-60W and is working at 100% efficiency.
(i) Calculate the resistance of bulb.
(ii) (a) Draw the circuit diagram.
(b) What is the rate of conversion of energy in each bulb?
(c) Total power used by the bulbs.
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With reference to the diagram shown below calculate:
(i) The equivalent resistance between P and Q.
(ii) The reading of ammeter.
(iii) The electrical power between P and Q.
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State other bigger units of electric power and express them in watt.
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State (i) the S. I. unit, (ii) the household unit, of electrical energy. How are these units related?
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An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?
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I ampere of current is passed through a resistor of resistance R ohm for time t second. Obtain expression for
(i) the electrical energy, and
(ii) the electrical power spent.
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How can electric energy consumed by an electric appliance be calculated in kilowatt hour (kWh)?
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What is the resistance of an appliance rated at V volt, P watt?
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