how do you draw this circuit (phys paper 6)

[balloonsandhighlighters]

The three lamps are now connected in parallel with one another. Draw a circuit
diagram of the three lamps connected to the power supply. Include in your circuit
diagram
(i) an ammeter to record the total current through the lamps,
(ii) a variable resistor to vary the brightness of all three lamps,
(iii) a voltmeter to record the potential difference across the lamps.

the paper is 2004 may june.

Well, I think that you draw an ammeter for each lamp, and then only one voltmeter at the end. but what about the variable resistor? How would we connect it? Should each lamp have one? And where would it be?

ALSO, what if they asked for a potential divider? Hmmmmm.... thanks!

 

[chocolate brown ooooh]

the variable resistor should NOT be for each lamps ....infact it should be right on the top

 

[chocolate brown ooooh]

 

[chocolate brown ooooh]

like the above but as u know there will be three lamps.each one will have an ammeter

 

[Ritter]

 

[balloonsandhighlighters]

thank you so much - very helpful!!!

 

[balloonsandhighlighters]

the variable resistor should NOT be for each lamps ....infact it should be right on the top

thank you very much

 

[chocolate brown ooooh]

let me know if u want some notes

 

[chocolate brown ooooh]

And you'll do fine for paper 6 learn all the 5 topics experiments precautions.

Physics laboratory safety precautions / rules:

* Live wires should not be touched.

* Hot Objects should not be touched with barren hands instead of that gloves should be used the most common process is heating of water in thermodynamic experiments.
* Circuit connections should be checked and approved by the teacher and then only the circuit should be switched ON.
* While changing components of the circuit the power should be switched so that one should not experience electric shocks.
* Safety spectacles, gloves and other safety components should be used while handling experiments.
* While handling a mercury thermometer one should take of the mercury spills.
* No other laboratory instruments should be touched or handled which is not involved in the course of experiments.
micrometer : can measure the thickness of any small thing to 0.01 mm
vernier : can measure the inner and outer wall of anything to 1.05mm
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question
Statements & justification
The rest are calculations and measurements
To produce more accurate or reliable results:
• Repeat experiment, to calculate average reading.
• Avoiding parallax error, look perpendicular to the ruler.
• If accuracy in measurement was asked, check for zero error.
Improvements that could be done to the experiment (temp. cooling):
• Same initial temperature.
• Same volume of water.
• Same shape of beaker.
• Beakers of same surface.
• Same room temperature.
• Stirring the water in the beakers.
• Same time intervals.
• Same surface area. (Unless given different containers)
• Adding water or cooling effect at regular intervals.
Heat loss could be reduced by:
• Insulation of beaker.
• Covering beaker with a lid.
For 2 values to be directly proportional,
• The graph of the values must be a straight line from the origin.
• As value 1 increase, value 2 increases.

For images produced from lenses on screens, precautions taken:
• Use of a darkened room for the experiment.
• Avoiding parallax error in measurement, and look perpendicular to the ruler.
• Object and lens at the same height from bench.
• Object/lens/screen is perpendicular to the bench.
To draw an image created from lens:
• Inverted from the original object.
• Sides are multiplied by the magnification.
*If values have difference by 0.1 or 0.01, that is the limit of experimental accuracy, so answers are about the same.
For spring extension experiment, variables that should be constant in the experiment:
• Number of coils.
• Diameter of spring.
• Selection of loads.
• Mass of spring.
micrometer : can measure the thickness of any small thing to 0.01 mm
vernier : can measure the inner and outer wall of anything to 1.05mm
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question
Statements & justification
The rest are calculations and measurements
To produce more accurate or reliable results:
• Repeat experiment, to calculate average reading.
• Avoiding parallax error, look perpendicular to the ruler.
• If accuracy in measurement was asked, check for zero error.
Improvements that could be done to the experiment (temp. cooling):
• Same initial temperature.
• Same volume of water.
• Same shape of beaker.
• Beakers of same surface.
• Same room temperature.
• Stirring the water in the beakers.
• Same time intervals.
• Same surface area. (Unless given different containers)
• Adding water or cooling effect at regular intervals.
Heat loss could be reduced by:
• Insulation of beaker.
• Covering beaker with a lid.
For 2 values to be directly proportional,
• The graph of the values must be a straight line from the origin.
• As value 1 increase, value 2 increases.
For images produced from lenses on screens, precautions taken:
• Use of a darkened room for the experiment.
• Avoiding parallax error in measurement, and look perpendicular to the ruler.
• Object and lens at the same height from bench.
• Object/lens/screen is perpendicular to the bench.
To draw an image created from lens:
• Inverted from the original object.
• Sides are multiplied by the magnification.
*If values have difference by 0.1 or 0.01, that is the limit of experimental accuracy, so answers are about the same.
For spring extension experiment, variables that should be constant in the experiment:
• Number of coils.
• Diameter of spring.
• Selection of loads.
• Mass of spring.
for improving the accuracy of the results (for experiments):
Minimizing heating effect of a current:
• Lower current
• Increase voltage
• Add a lamp
• Increase resistance of a resistor
To increase accuracy of ray diagrams
• View bases of pins since pins may not be vertical
• Keep pins further apart
• Use more pins
• Avoid parallax, explain action and reason
• Repeats and average
Adjustments made to experiments will be made to increase accuracy
Improvement made to experiments about heating effect and insulation
• Lids
• Repeats
• Stirring
• Record max. Temperature
• Add insulation
• Keep constant room temperature
• Avoid heat loss
How to check if a rule is vertical:
• Protractor
• Use of set square
• Plumb line
• Spirit Level
Precautions taken in experiments about formation of images by a lens
• Use a darkened area
• Meter ruler on bench or clamped
• Object and lens same height on bench
• Mark on lens holder to show center of lens
• Take more readings
• Avoid parallax error, explain action and reason
• Lens\screen perpendicular to bench
Variables in experiments about springs and stretching effect:
• Number of coils
• Length of spring
• Diameter\thickness of spring or wire
• Range of loads
• Length of wire
• Coil spring
Sources of error in calculating circumference by string method:
• Parallax
• Diagonal winding
• Thickness of string
Improvement made to calculating circumference by string method
• Avoid parallax error
• Repeats and average
• Thinner string
• Parallel winding of springs
It's not the BEST list in the world, but hopefully it will help...
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question

 

[chocolate brown ooooh]

ur always welcome!!!!!

 

[balloonsandhighlighters]

Oh mu

And you'll do fine for paper 6 learn all the 5 topics experiments precautions.

Physics laboratory safety precautions / rules:

* Live wires should not be touched.

* Hot Objects should not be touched with barren hands instead of that gloves should be used the most common process is heating of water in thermodynamic experiments.
* Circuit connections should be checked and approved by the teacher and then only the circuit should be switched ON.
* While changing components of the circuit the power should be switched so that one should not experience electric shocks.
* Safety spectacles, gloves and other safety components should be used while handling experiments.
* While handling a mercury thermometer one should take of the mercury spills.
* No other laboratory instruments should be touched or handled which is not involved in the course of experiments.
micrometer : can measure the thickness of any small thing to 0.01 mm
vernier : can measure the inner and outer wall of anything to 1.05mm
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question
Statements & justification
The rest are calculations and measurements
To produce more accurate or reliable results:
• Repeat experiment, to calculate average reading.
• Avoiding parallax error, look perpendicular to the ruler.
• If accuracy in measurement was asked, check for zero error.
Improvements that could be done to the experiment (temp. cooling):
• Same initial temperature.
• Same volume of water.
• Same shape of beaker.
• Beakers of same surface.
• Same room temperature.
• Stirring the water in the beakers.
• Same time intervals.
• Same surface area. (Unless given different containers)
• Adding water or cooling effect at regular intervals.
Heat loss could be reduced by:
• Insulation of beaker.
• Covering beaker with a lid.
For 2 values to be directly proportional,
• The graph of the values must be a straight line from the origin.
• As value 1 increase, value 2 increases.

For images produced from lenses on screens, precautions taken:
• Use of a darkened room for the experiment.
• Avoiding parallax error in measurement, and look perpendicular to the ruler.
• Object and lens at the same height from bench.
• Object/lens/screen is perpendicular to the bench.
To draw an image created from lens:
• Inverted from the original object.
• Sides are multiplied by the magnification.
*If values have difference by 0.1 or 0.01, that is the limit of experimental accuracy, so answers are about the same.
For spring extension experiment, variables that should be constant in the experiment:
• Number of coils.
• Diameter of spring.
• Selection of loads.
• Mass of spring.
micrometer : can measure the thickness of any small thing to 0.01 mm
vernier : can measure the inner and outer wall of anything to 1.05mm
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question
Statements & justification
The rest are calculations and measurements
To produce more accurate or reliable results:
• Repeat experiment, to calculate average reading.
• Avoiding parallax error, look perpendicular to the ruler.
• If accuracy in measurement was asked, check for zero error.
Improvements that could be done to the experiment (temp. cooling):
• Same initial temperature.
• Same volume of water.
• Same shape of beaker.
• Beakers of same surface.
• Same room temperature.
• Stirring the water in the beakers.
• Same time intervals.
• Same surface area. (Unless given different containers)
• Adding water or cooling effect at regular intervals.
Heat loss could be reduced by:
• Insulation of beaker.
• Covering beaker with a lid.
For 2 values to be directly proportional,
• The graph of the values must be a straight line from the origin.
• As value 1 increase, value 2 increases.
For images produced from lenses on screens, precautions taken:
• Use of a darkened room for the experiment.
• Avoiding parallax error in measurement, and look perpendicular to the ruler.
• Object and lens at the same height from bench.
• Object/lens/screen is perpendicular to the bench.
To draw an image created from lens:
• Inverted from the original object.
• Sides are multiplied by the magnification.
*If values have difference by 0.1 or 0.01, that is the limit of experimental accuracy, so answers are about the same.
For spring extension experiment, variables that should be constant in the experiment:
• Number of coils.
• Diameter of spring.
• Selection of loads.
• Mass of spring.
for improving the accuracy of the results (for experiments):
Minimizing heating effect of a current:
• Lower current
• Increase voltage
• Add a lamp
• Increase resistance of a resistor
To increase accuracy of ray diagrams
• View bases of pins since pins may not be vertical
• Keep pins further apart
• Use more pins
• Avoid parallax, explain action and reason
• Repeats and average
Adjustments made to experiments will be made to increase accuracy
Improvement made to experiments about heating effect and insulation
• Lids
• Repeats
• Stirring
• Record max. Temperature
• Add insulation
• Keep constant room temperature
• Avoid heat loss
How to check if a rule is vertical:
• Protractor
• Use of set square
• Plumb line
• Spirit Level
Precautions taken in experiments about formation of images by a lens
• Use a darkened area
• Meter ruler on bench or clamped
• Object and lens same height on bench
• Mark on lens holder to show center of lens
• Take more readings
• Avoid parallax error, explain action and reason
• Lens\screen perpendicular to bench
Variables in experiments about springs and stretching effect:
• Number of coils
• Length of spring
• Diameter\thickness of spring or wire
• Range of loads
• Length of wire
• Coil spring
Sources of error in calculating circumference by string method:
• Parallax
• Diagonal winding
• Thickness of string
Improvement made to calculating circumference by string method
• Avoid parallax error
• Repeats and average
• Thinner string
• Parallel winding of springs
It's not the BEST list in the world, but hopefully it will help...
Control Variables
Precautions
Units ( eg.. voltage is V etc. ) cause the units hold 1 mark of the question

OH MY LORD !! Thank you soo much for these notes!! You're such a lovely person Gahhhh <3 <3 I also made notes which you'll find in the forum, so check them out if you want oH BTW, pls can you explain 'limits of experimental accuracy? You've mentioned it in the notes however i don't quite understand it Thanks again!

 

[chocolate brown ooooh]

it just means that ....you know sometimes when u do a an experiment,the result wouldn't be exact due to some variables...when the answer u got from the experiment is near the actual answer-it means that it is in the limits of experimental accuracy.