RP
Cards (5)
- RESISTANCE:
- use ammeter to measure current, voltmeter to measure pd
- attach wire to m ruler using tape and connect wire to the rest of circuit using 2 crocodile clips directly starting from 0
- move crocodile clips further apart to increase length of the wire in circuit
- change the length of wire 4 times and measure the resistance using R= V/I
- plot results and get a directly proportional graph
- CURRENT/DIODE CHARACTERISTICS:
- voltmeter= pd across resistor milliammeter= current through resistor
- record values in table
- adjust variable resistor and record the new readings on the voltmeter and ammeter and do several times
- switch direction of the battery = pd is reversed
- repeat 1-3
- plot a graph this a IV CURVE result =
- THERMAL INSULATOR:
- place small beaker inside larger beaker
- use kettle to boil water
- pour 80cm3 of hot water into small b
- use piece of cardboard as lid with hole for large b
- place thermometer through hole and measure initial temp and start stopwatch
- record temp every 3 mins for 15mins
- repeat using same volume of hot water with 2 newspaper wrapped around gap between 2 beakers
- repeat steps 1-6 and use different number of layers (4,6) each time with same volume of water and temp
- record results on table and plot graph
- SHC:
- place beaker on top pan balance and press 0
- add oil to beaker and record mass
- place thermometer and immersion heater into oil and read starting temp of oil
- wrap beaker with insulating form to reduce thermal energy transfer to surroundings
- connect joulemeter n powerpack to immersion heater
- time for 30mins = temp to rise enough
- read no of joules of energy passed into heater and read final temp of oil
- use equation [insert] change in thermal/ mass x temp change
- how to find the volume of irregular object:
- fill eureka can with water
- place object into water= water will be displaced and flow out of the can thru the spout
- measure volume of water displaced