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9 Nov 2019
A group of students performed the potentiometer experiment using a cadmium standard cell having an emf of 1.0178 volts. When placing this standard cell in the slide-wire potentiometer (negative terminal of the power supply was connected to the zero end of the slide wire/ meter stick), they found that the galvanometer was zeroed when the sliding terminal was placed at the 64.1 cm mark. The students then replaced the standard cell with an unknown cell and re-balanced the bridge by moving the sliding terminal to the 45.7 cm mark. Draw the circuit diagram for the potentiometer as used in the lab. Use the above information to find the emf of the unknown cell. The students then removed the unknown cell from the potentiometer circuit and connected an analog voltmeter (internal resistance of voltmeter=3175 ohm) across it and obtained a reading of 1.48 volts. Use this information to find: the current flowing out of the unknown cell when the analog voltmeter was connected to it. the internal resistance of the unknown cell. d) A nickel-cadmium cell has an emf of 1.27 volts and internal resistance 135 CL It is connected in series with a 50 ohm resistor and an analog volt meter of internal resistance 3175 ohm. Find: the current flowing in the circuit. the reading of the analog voltmeter
A group of students performed the potentiometer experiment using a cadmium standard cell having an emf of 1.0178 volts. When placing this standard cell in the slide-wire potentiometer (negative terminal of the power supply was connected to the zero end of the slide wire/ meter stick), they found that the galvanometer was zeroed when the sliding terminal was placed at the 64.1 cm mark. The students then replaced the standard cell with an unknown cell and re-balanced the bridge by moving the sliding terminal to the 45.7 cm mark. Draw the circuit diagram for the potentiometer as used in the lab. Use the above information to find the emf of the unknown cell. The students then removed the unknown cell from the potentiometer circuit and connected an analog voltmeter (internal resistance of voltmeter=3175 ohm) across it and obtained a reading of 1.48 volts. Use this information to find: the current flowing out of the unknown cell when the analog voltmeter was connected to it. the internal resistance of the unknown cell. d) A nickel-cadmium cell has an emf of 1.27 volts and internal resistance 135 CL It is connected in series with a 50 ohm resistor and an analog volt meter of internal resistance 3175 ohm. Find: the current flowing in the circuit. the reading of the analog voltmeter