Phsyics P1 Required Pract

Question 1

Specific heat cap steps

Answer 1

1. Set balance to zero w beaker on it
2. Add oil and record mass
3. Place thermometer and immersion heater- connected to a jojo meter, in the oil, wrap in insulating foam
4. Record initial temp
5. Leave for 30 mins so temp can rise
6. Read number of joules and final temp
7. Specific heat = energy / mass x change in temp

Question 2

Sources of inaccuracy in spec heat cap experiment

Answer 2

• thermal energy could pass out of beaker so should insulate
• not all thermal energy passes into oil so should make sure heater is fully submerged
• incorrect reading of thermometer so should use electronic probe

Question 3

Current voltage components in the circuit

Answer 3

• battery
• wired
• voltmeter and amenter
• variable resistor
• chosen thing in parallel w voltmeter

Question 4

How to do current pd practical

Answer 4

• make not of PD and current
• change resistence w the variable resistor and make note again
• repeat
• switch direction of battery
• continue taking readings at dif resistences of pd and current
• EXTRA resistor in diode one as is easily damaged

Question 5

Reason for filament lamp graph

Answer 5

• when current increases temp of lamp increases
• this means resistence increases which slows current

Question 6

Équipement in resistence prac

Answer 6

• battery
• a meter and voltmeter
• wire
• switch

Question 7

Resistence prac steps

Answer 7

• attach wire using tape to ruler and connect using two crocodile clips to rest of circuit
• you can move closer and further apart and measure resistence in ten circuit
• resistence is proportional to length

Question 8

In accuracies in resistence prac

Answer 8

• zero error: reading when value should be zero, can’t be stopped so we need to subtract it from our readings
• contact between croc clip and wire caused some resistence
• temp of wire increases resistence; we should use a low PD to keep current low and only turn on when taking a reading