IAA - LDR Investigation

IAA - LDR Investigation including validity and reliability, independent and dependant variables

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LDR Investigation
Reliability:
REPEAT results, and then make an average to plot a bar chart to
show the results
Ignore all anomalies or replace them
Compare results to make sure they are similar
Validity:
`Fair test'
Same apparatus: lamp due to different wattages varying the
brightness
Make sure distance is the same (ruler)
Multimeter set to the same setting
Independent variable ­ sheets of tracing paper to affect the resistance
Dependent variable ­ Ohms (resistance)
LDR computer screen investigation:
Same picture
Same setting (brightness)
Repeat
Compare
Hold LDR against the screen to prevent other light sources
affecting the resistance

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