Three resistors 1ohm ,2 ohm and 3ohm are connected in series with a 3V battery and a voltmeter is connected across 1ohm resistance. How would the reading of voltmeter change if connected across 3ohm. Justify

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Solution

$V o l t a g e a c r o s s 1 o h m r e s i s \tan c e i s 3 V t h e n v o l t a g e a c r o s s 3 o h m r e s i s \tan c e w i l l b e V_{2} = \frac{R_{2}}{R_{1}} \times V_{1} = \frac{3}{1} \times 3 = 9 V$

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Three resistors 1ohm ,2 ohm and 3ohm are connected in series with a 3V battery and a voltmeter is connected across 1ohm resistance. How would the reading of voltmeter change if connected across 3ohm. Justify

Voltage across 1ohm resistance is 3Vthen voltage across 3ohm resistance will beV2=R2R1×V1=31×3=9V

$V o l t a g e a c r o s s 1 o h m r e s i s \tan c e i s 3 V t h e n v o l t a g e a c r o s s 3 o h m r e s i s \tan c e w i l l b e V_{2} = \frac{R_{2}}{R_{1}} \times V_{1} = \frac{3}{1} \times 3 = 9 V$