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?
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?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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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?
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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