Required practicals p1 Flashcards
What are the 4 required practicals?
SHC
Current/ PD Charatceristics
Resistance
Density
What is SHC?
The Specific Heat Capacity (S.H.C.) of a substance is the amount of energy required to raise the temperature of 1kg of the substance by 1 degree Celsius
SHC Required Practical
1) Measure mass of block
2) Insulate block
3) Record temperature of block
4) Set power supply to 10V
5) Take readings of temperature and current every minute for 10
Give one source of inaccuracy and it’s solution for SHC required practical:
Thermal energy passing out of beaker into air -> use an insulator with a lower thermal conductivity
Resistance Required Practical
1) Attach both crocodile clips 10cm away from each other
2) Record current and pd
3) Increase distance of crocodile clips and repeat recordings
Why shouldn’t you put the crocodile clips too close together/ higher pd?
prevent wire from overheating
What should you remember to do during the resistance practical?
Only turn on current/ switch when taking readings
Current/ Pd characteristics Practical
BAV - Battery, Ammeter, Voltmeter
Variable resistor
Tested: Resistor, filament bulb, diode
1) Vary the resistance of the variable resistor
2) Record current values from ammeter and potential difference values from voltmeter
3) Reverse the connections of the component
4) Repeat the readings in the negative direction
5) Plot the graph (an I to V graph)
Measuring density of a solid object
1) Measure mass
2) If regular -> measure to calculate volume. If irregular -> submerge in eureka can filled w/water. Water displaced is transferred to measuring cylinder as volume.
3) Mass/ volume = density
Measuring density of a liquid
1) Place a measuring cylinder on balance and zero it.
2) Pour 10ml of liquid and record mass
3) Add another 10ml and repeat process until cylinder full.
4) For each measurement, find density
5) Take an average of calculated densities.
