Can u elaborate the explanation? Does't brightness of lamp depend on power why did they mention only current? How does moving contact to Q increase resistance which then decreases voltage? The circuit contains a variable potential divider PQ, a lamp and a voltmeter.THE VARIABLE POTENTIAL DIVIDERPQ IS A VARIABLE RESISITORA VARIABLEpower supplyPOTENTIAL DIVIDERIS ALSO CALLED ATHE LAMP AND VARIABLE RESISTORPOTENTIOMETERARE CONNECTED IN SERIES WITHTHE POWER SUPPLYV = IxR ↑AS THE COMPONENTS ARECONNECTED IN SERIES, THE LAMPAND VARIABLE RESISTOR WILLThe sliding contact of the potential divider is moved towards end Q.EACH RECEIVE THE SAME CURRENTWhat happens to the brightness of the lamp and what happens to the voltmeter reading?HENCE CHANGING THE VARIABLE RESISTOR DOES NOTbrightness of lampvoltmeter readingCHANGE THE BRIGHTNESS OF THE LAMP. IGNOREAbecomee-brighterdeereaeee XANSWERS A&BBbeeemee-brighterinereneee XMOVING THE SLIDING CONTACT TOWARDS Q INCREASESTHE RESISTANCE, R. THE CURRENTI IS CONSTANT, SoTHE P.D, V, AND SO THE READING ON THE VOLTMETER,WILL DECREASE. HENCE ANSWER C IS CORRECTdoes not changedecreases VDdoes not changeincreases >X

Answered: Can u elaborate the explanation? Does't…

Can u elaborate the explanation? Does't brightness of lamp depend on power why did they mention only current? How does moving contact to Q increase resistance which then decreases voltage?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 49P: The timing device in an automobile's intermittent wiper system is based on an RC rime constant and...

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Question

Can u elaborate the explanation? Does't brightness of lamp depend on power why did they mention only current? How does moving contact to Q increase resistance which then decreases voltage?

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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