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Flashcards in Pracitcals. Deck (4)
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1
Q

How to investigate the specific heat capacities?

A

Material needs 2 holes for heated and themometer.
Measure mass then insulate.
Insert themometer and heater.
Meausure start temperature.
Set PD to 10v. Turn on power supply and stopwatch.
As block heats up take reading of temperature and current every 10 minutes.
When 10 readings are collected you can now caluculate the power.
Plot a graph.
Find the gradient then SHC= 1 / Gradient x mass of block.

2
Q

How to inestigate the effectiveness of materials as themal insulators.

A

Boil water.
Pour in a sealable container and measure.
Measure starting temperature.
Leave it for 5 minutes and start stopwatch.
Measure final temperature.
Pour the water and allow the container to cool to room temperature.
Repeat with differnt insulators.
Lower temperature difference the better thermal insulator it is.
Thick materials are better insulators less energy is transferred.

3
Q

How can you investigate the factors affecting resitance?

A

Attatch a crocid
ile clip to the wire level with 0cm on the ruler.
Attatch the second clip 10cm away from the 1st and right doen the distance.
Close switch and record current and pd.
Open the switch and move second clip another 10cm.
Close switch and record current and pd again.
Find resistance - R- V / I
Plpt a graph resistanc against length and draw a line of best fit.
It should be directly proportional. the longer the wire the greater the resistance.

4
Q

How to inestigate the IV Characterisitics.

A

Vary variable resisor which alters current and the pd across it.
take several readings to see how pd changes as the current varies.
Repeat 2x to get an average
swap wire so current direction is reversed.
Plot graph current against volatge for component.