Paper 1 - required practicals Flashcards
Write a method for a specific heat capacity practical
- Measure the mass of your material in kg
- Wrap insulation around your block or beaker
- Measure the starting temp of your block or water
- Put a heater into large hole of the block and connect ammeter, power pack and heater in series.
- Connect voltmeter across the power pack
- Turn on the power pack and start stopwatch at the same time.
- Record ammeter and voltmeter readings every 60 seconds. Record the temp of the block every 60 seconds
- After 10 minutes turn off the pack
- Record the maximum temperature of the metal block
- Calculate the power and record results.
- Plot a graph of your results.
Why is it important to stir the water regularly? (RP1 - SHC)
To ensure all water is evenly heated.
Identify and mitigate one safety hazard (RP1 - SHC)
Be careful with boiling water close to your eyes. Wear goggles to avoid damage
Write a method for a thermal insulation practical
- Set up 6 beakers and 5 layers of insulating material around each beaker.
- Pour 200cm of hot water into each beaker
- Use a piece of cardboard with a hole in as a lid
- Push thermometer through the hole in the cardboard lid so the bulb is in the water
- Measure the temperature of the water and start the stopwatch.
- Measure the temperature every 5 minutes and record the results in a table.
- Continue for 20 minutes
- Draw a graph to show the most effective material
Why do you have a piece of cardboard as a lid over the beaker? (RP2 - thermal)
This is to stop the heat escaping to ensure that the results are accurate. This is called a closed system.
Write a method for a practical investigating how the length of a wire affects the resistance
- Set up the circuit.
- Attach a metre rule with a wire below the voltmeter. Use crocodile clips to secure.
- Place the crocodile clips 100cm apart.
- Measure both the Pd and the current through the wire and record.
- Turn off the power pack and reduce the length of the wire by 10cm.
- Repeat steps 4 and 5 for all wires down to 10cm .
- Calculate the resistance for each length
- Plot a graph of resistance using the recorded information
Describe the relationship between the length of the wire and its resistance
As the length increases the resistance increases. They are directly proportional.
Write a method for a practical investigating resistors in parallel circuits.
- Set up a circuit with a voltmeter, 2 resistors in series, ammeter, closed switch.
- Turn on power pack
- Measure the Pd across the power pack.
- Measure the Pd across each individual resistor the the current.
- Calculate the total resistance of the circuit.
- Set up the circuit for two resistors in parallel.
- Repeat steps 2-4 for the resistors in parallel
- Calculate the total resistance of the circuit.
Write a method for the IV - characteristic : diode
- Set up the circuit
- Record the values of current and Pd for different settings of the variable resistor.
- Take 5 pairs of readings and turn off the power pack in between readings.
- Swap the leads at the power pack to the Pd is negative.
- Take an additional 5 readings and record them.
Write a method for the IV - characteristic : filament lamp
- Construct the circuit
- Record the values of current and Pd for different settings of the variable resistor.
- Take 5 pairs of readings and record.
- Swap the leads at the power supply and make the Pd negative.
- Take an additional 5 readings and record them.
Write a method for the IV - characteristic : resistor
- Construct the circuit
- Record the values of current and Pd for different settings of the variable resistor.
- Take 5 pairs of readings and record.
- Swap the leads at the power supply and make the Pd negative.
- Take an additional 5 readings and record them.
Explain why the power supply should be turned off in between readings.
To ensure that the power supply doesn’t overheat and begin to spark or catch light as this can cause damage to other components.
