Turn the Multimeter o Part L-2: Using a Voltmeter 7. Using one of the meters pro

Question

Turn the Multimeter o Part L-2: Using a Voltmeter 7. Using one of the meters provided, change the setting on the meter so it can be used as a voltmeter. Use the 20V setting first. Turn it on and then change the setting to 2000 mV and then to 200V. What do you notice about the digital display? 8. Which setting will be most useful in measuring the potential difference across the bulb in the circuit you just constructed? Explain. ANPROBE ume 9. Measure and record the AV across the bulb. How does this compare with the potential difference of the power supply? Explain. 10. Switch the leads of the voltmeter and measure AV across the bulb again. What do you notice about the voltmeter reading this time? Explain why this occurs. 11. Now replace the bulb holder with the resistor you used in the first place. Measure and record the Av across the resistor. How does this compare with the bulb? Explain.

Explanation / Answer

(7) When the setting is changed at 2000 mV,

'mV' sign is shown at the right corner of the multimeter.

And, when the setting is changed at 200 V,

'V' sign is shown at the right corner.

(8) For measuring the potential difference across the bulb, we should keep the knob at 200 V.

(9) Potential difference across the power supply is greater in comparison with the potential difference across the bulb.

(10) If the power supply is AC, then there is no difference, But, if we are using DC supply, then negative potential will display.

(11) When we use the resistor in place of the bulb, the potential difference across the bulb is drastically low in comparison of the bulb.

(12) Level upper one as AMMETER (Series in circuit) and the othe as VOLTMETER (Parallel in the circuit).

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