required practicals Flashcards
1
Q
specific heat capacity
A
- Gather a block of the metal you want to test, with two holes in it. Set up the apparatus so that in one hole there is a heater wired up to a power supply and an ammeter, and in the other hole there is a thermometer. Insulate the block, too.
- Measure the initial temperature of the block, then set the potential difference of the power supply to 10V, and turn it on, starting a stopwatch at the same time.
- Take a reading of the temperature of the block every minute for 10 minutes
- Use P=IV and E=PT to find how much energy was transferred to the heater at every temperature reading, then plot a graph.
- Use the equation ΔE = m c Δθ to find the specific heat capacity of the metal.
- Repeat 3 times, and then with other metals.
2
Q
resistance
A
- Set up the apparatus so that you have a circuit with a power source, two crocodile clips attached to a wire that is attached to a ruler, an ammeter and voltmeter.
- Attatch a crocodile clip to the ruler wire at 0cm, and the second at a fixed increment away from it, e.g. 10cm.
- Close the switch and then record the current and potential difference of the wire. Open the switch, move the second crocodile clip e.g. 10cm further away (it would now be at 20cm away from the first), then repeat this step along the whole length of the ruler.
- Use these measurements to calculate the resistance for each length of wire.
- Plot a graph of resistance against wire length and draw a line of best fit.
3
Q
i-v characteristics
A
4
Q
density
A
5
Q
force and extension
A
6
Q
newton’s second law
A
7
Q
waves
A
8
Q
ir radiation and absorption
A
