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9. (a) In the given circuit, when the switch is OFF, the voltmeter reads 9 V and ammeter reads 0 A. However, when the switch is ON, the voltmeter reads 7V and ammeter reads 250 mA. Explain why the voltmeter reading decreases when the switch is closed? Calculate the values of load resistance (R) and internal resistance (r). A (b) A 14 W energy efficient CFL lamp, is designed to produce the same illumination, as a conventional 60 W, light bulb. How much money does the user of the energy efficient lamp save in 1 month, if the lamp is used for 10 hours / day. The cost of electricity is 10 Bz/KWh
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Transcribed Image Text:9. (a) In the given circuit, when the switch is OFF, the voltmeter reads 9 V and ammeter reads 0 A. However, when the switch is ON, the voltmeter reads 7V and ammeter reads 250 mA. Explain why the voltmeter reading decreases when the switch is closed? Calculate the values of load resistance (R) and internal resistance (r). A (b) A 14 W energy efficient CFL lamp, is designed to produce the same illumination, as a conventional 60 W, light bulb. How much money does the user of the energy efficient lamp save in 1 month, if the lamp is used for 10 hours / day. The cost of electricity is 10 Bz/KWh
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