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The circuit contains a variable potential divider PQ, a lamp and a voltmeter THE VARIABLE POTENTIAL DIVIDER A VARIABLE power supply PQ IS A VARIABLE RESISITOR POTENTIAL DIVIDER IS ALSO CALLEDA POTENTIOMETER THE LAMP AND VARIABLE RESISTOR ARE CONNECTED IN SERIES WITH THE POWER SUPPLY LV = I x R ↑ AS THE COMPONENTS ARE CONNECTED IN SERIES, THE LAMP AND VARIABLE RESISTOR WILL The sliding contact of the potential divider is moved towards end Q. EACH RECEIVE THE SAME CURRENT What happens to the brightness of the lamp and what happens to the voltmeter reading? brightness of lamp HENCE CHANGING THE VARIABLE RESISTOR DOES NOT voltmeter reading CHANGE THE BRIGHTNESS OF THE LAMP. IGNORE becomee-brighle deereaeee X ANSWERS A&B A beeomee-brighter mereeeee X MOVING THE SLIDING CONTACT TOWARDS Q INCREASES THE RESISTANCE, R. THE CURRENT / IS CONSTANT, So THE P.D, V, AND SO THE READING ON THE VOLTMETER, WILL DECREASE. HENCE ANSWER C IS CORRECT does not change decreases D. does not change increases X

The circuit contains a variable potential divider PQ, a lamp and a voltmeter THE VARIABLE POTENTIAL DIVIDER A VARIABLE power supply PQ IS A VARIABLE RESISITOR POTENTIAL DIVIDER IS ALSO CALLEDA POTENTIOMETER THE LAMP AND VARIABLE RESISTOR ARE CONNECTED IN SERIES WITH THE POWER SUPPLY LV = I x R ↑ AS THE COMPONENTS ARE CONNECTED IN SERIES, THE LAMP AND VARIABLE RESISTOR WILL The sliding contact of the potential divider is moved towards end Q. EACH RECEIVE THE SAME CURRENT What happens to the brightness of the lamp and what happens to the voltmeter reading? brightness of lamp HENCE CHANGING THE VARIABLE RESISTOR DOES NOT voltmeter reading CHANGE THE BRIGHTNESS OF THE LAMP. IGNORE becomee-brighle deereaeee X ANSWERS A&B A beeomee-brighter mereeeee X MOVING THE SLIDING CONTACT TOWARDS Q INCREASES THE RESISTANCE, R. THE CURRENT / IS CONSTANT, So THE P.D, V, AND SO THE READING ON THE VOLTMETER, WILL DECREASE. HENCE ANSWER C IS CORRECT does not change decreases D. does not change increases X

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PLEASE CHECK THE IMAGE AND ANSWER. (I ASKED SAME QUESTION BEFORE BUT WRONG ANSWER) 

MY MAIN QUESTION IS WHY DOES BRIGHTNESS REMAINS SAME? IF VOLTAGE DECREASES DOESN'T POWER DECREASE SO HOW BRIGHTNESS REMAINS SAME. PLEASE ELABORATE

The circuit contains a variable potential divider PQ, a lamp and a voltmeter. THE VARIABLE POTENTIAL DIVIDER PQ IS A VARIABLE RESISITOR A VARIABLE power supply POTENTIAL DIVIDER IS ALSO CALLED A THE LAMP AND VARIABLE RESISTOR POTENTIOMETER ARE CONNECTED IN SERIES WITH THE POWER SUPPLY V = IxR ↑ AS THE COMPONENTS ARE CONNECTED IN SERIES, THE LAMP AND VARIABLE RESISTOR WILL The sliding contact of the potential divider is moved towards end Q. EACH RECEIVE THE SAME CURRENT What happens to the brightness of the lamp and what happens to the voltmeter reading? HENCE CHANGING THE VARIABLE RESISTOR DOES NOT brightness of lamp voltmeter reading CHANGE THE BRIGHTNESS OF THE LAMP. IGNORE A becomee-brighter deereaeee X ANSWERS A&B B beeemee-brighter inereneee X MOVING THE SLIDING CONTACT TOWARDS Q INCREASES THE RESISTANCE, R. THE CURRENTI IS CONSTANT, So THE P.D, V, AND SO THE READING ON THE VOLTMETER, WILL DECREASE. HENCE ANSWER C IS CORRECT does not change decreases V D does not change increases >X
Transcribed Image Text:The circuit contains a variable potential divider PQ, a lamp and a voltmeter. THE VARIABLE POTENTIAL DIVIDER PQ IS A VARIABLE RESISITOR A VARIABLE power supply POTENTIAL DIVIDER IS ALSO CALLED A THE LAMP AND VARIABLE RESISTOR POTENTIOMETER ARE CONNECTED IN SERIES WITH THE POWER SUPPLY V = IxR ↑ AS THE COMPONENTS ARE CONNECTED IN SERIES, THE LAMP AND VARIABLE RESISTOR WILL The sliding contact of the potential divider is moved towards end Q. EACH RECEIVE THE SAME CURRENT What happens to the brightness of the lamp and what happens to the voltmeter reading? HENCE CHANGING THE VARIABLE RESISTOR DOES NOT brightness of lamp voltmeter reading CHANGE THE BRIGHTNESS OF THE LAMP. IGNORE A becomee-brighter deereaeee X ANSWERS A&B B beeemee-brighter inereneee X MOVING THE SLIDING CONTACT TOWARDS Q INCREASES THE RESISTANCE, R. THE CURRENTI IS CONSTANT, So THE P.D, V, AND SO THE READING ON THE VOLTMETER, WILL DECREASE. HENCE ANSWER C IS CORRECT does not change decreases V D does not change increases >X
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