Current (AMPS)
Length 10.0 cm Length 20.0 cm Length 30.0 cm Current (AMPS) Voltage (VOLTS) Resistance (OHMS) Current (AMPS) Voltage (VOLTS) Resistance (OHMS) Current (AMPS) Voltage (VOLTS) Resistance (OHMS) Thickness 32 SWG Constantin .66 .48 0.89 0.48 2.83 5.90 0.37 2.89 7.81 Thickness 26 SWG Constantin 2.70 0.92 0.34 2.07 .45 0.70 .46 .68 .15 Thickness 24 SWG Constantin 3.05 0.84 0.28 2.42 .15 0.48 .98 .36 0.69 Thickness 32 SWG Nichrome .01 .94 .92 0.61 2.38 3.90 0.42 2.45 5.84 Voltage 1 (VOLTS) Voltage 2 (VOLTS) Average Voltage (VOLTS) Current 1 (AMPS) Current 2 (AMPS) Average Current (AMPS) Resistance (OHMS) Length 10.0 cm .88 .91 .895 0.95 0.93 0.94 2.02 Length 20.0 cm 2.11 2.17 2.14 0.56 0.52 0.54 3.96 Length 30.0 cm 2.21 2.26 2.235 0.42 0.40 0.41 5.45 Length 40.0 cm 2.32 2.39 2.355 0.33 0.30 0.315 7.48 Length 50.0 cm 2.43 2.45 2.44 0.24 0.28 0.26 9.38 Length 60.0 cm 2.52 2.56 2.54 0.21 0.18 0.195
What is an Electron Microscopy?
Electron Microscopy What is an Electron Microscopy? Microscopes are used to look at objects that cannot be seen by the naked eye. There are two types of microscopes: light microscopes which use light to see the image these microscopes use lenses and light to project the image in to the eye, and the second are electronic microscopes these use electrons and magnets to project an image on to a fluorescent screen since electrons can not be seen by our eyes. How does it work? . Electrons are fired from an electron gun. 2. Electrons then travel through a vacuum. 3. They go through the specimen and objective lens. 4. The electrons then hit a flourescent screen and make light. 5. The light makes a picture (electron micrograph), which is visible to the human eye. Electrons can be affected by such as air molecules that's why they have to travel through a vacuum and that's why a fluorescent screen is used because they cannot travel trough glass. Advantages * Small wavelength gives better resolution. * They produce sharp definition. * They can focus using magnets so can get very good micrographs. Disadvantages * Very expensive. * Very big. * Sometimes artefacts are made (not what is in the specimen can be seen) * Hard to cut specimen so thin. * Sometimes electrons do not pass. * Living specimens cannot be seen. * Must be stained in very
Universe - Definitions
Quasars Possibly extremely dense neutron stars giving off radiation. Once thought to be the bright centre of other galaxies. Pulsars These are neutron stars that emit an enourmous amount of radiation. They spin hundreds of times a second and we pick up the radio waves on Earth. Neutron Stars Formed from very large stars collapsing. Between 10 and 100 km in diameter a they can have a mass many times that of the sun. A star 8 times that of the sun creates a neutron star 1.5 times that of the sun. The rest of the mass is blown into the space. Black Holes Black holes that are worth considering are only found at the centre of galaxies. The centre of every galaxy has a black hole. It keeps the galaxy together with its immense gravity and is 10 times denser than what would be expected if there were just stars at the centre of our galaxy. Nothing escapes, not even light. Photons are captured and added to the gravity. 0 point field No dimensions. Cells take light from it to tell other cells where to go in growing. Where does gravity come from? There is infinite energy from gravity so in theory it could be converted into infinite
Technology in Space > Solar Cells & Electric Circuits > Internal Resistance
PHYSICS : Technology in Space > Solar Cells & Electric Circuits > Internal Resistance E = I (R+r) E = IR + Ir and V = I x R Since IR = E - Ir then V = E - Ir Method: A circuit was set up as above, incorporating a variable resistor and an ammeter and a voltmeter to measure the current and voltage across the resistor respectively. Results: The readings of V and I were recorded as follows: V I 5.70 .55 6.24 .00 6.55 0.72 6.75 0.57 6.87 .48 7.09 .40 7.15 .35 7.22 .31 7.29 0.28 7.34 0.25 A graph was plotted to show V against I and from this the values of E and -r can be calculated. [See graph] Conclusion & Calculation: V = -rI + V = -rI + E -r = 7.34/0.25 = 29.36? E = 7.85 The value of E extrapolated from the graph is 7.85, and the internal resistance of the power supply is
My perfect night
My perfect night A poem by Jamie Barratt My perfect night, of which there are few is a place by the sea with a picturesque view I'll watch the sun as it rises and falls A lone whale swims, making gentle calls Stars will appear, darkness descend I gaze with wonder through an enlarged lens A full moon emerges, a giant in the sky A sight less than stunning would be a lie Listening to the sea lapping on the shore feeling my senses yearning for more The scent of sea air surrounds me so On occasions I don't smell it, I feel so low A sea so serene, a sky so clear many stars shimmer brightly, they appear so near I use these nights as a time to reflect on a world of cruelty, anger and
Letter to Government
Dear Editor, I am writing to you on behalf of your article in this weeks paper I think the curfew is a fantastic idea I am in full support of the Council proposing this great curfew. Where I live under 16's are taking over my neighbourhood me and the other residents in the area are feeling threatend by these gangs of 'yobs' hanging around our area. All they do is go around drinking and creating uneeded noise which I and the rest of our neighbourhood would agree on. While we adults are staying indoors scared of going out they are out commiting crimes and going round doing under age drinking and under age sex and if the parents of these children could see what I see nearly every night then I'm sure they would be in support with me. As I said before I am scared to go out of my house to go to the shops or to the pub or anywhere! because I am scared of getting jumped or mugged or even killed. Also this curfew would be a good idea because it would give new employees in the police force good experience of dealing with these situations so they are confident and experienced when it comes to a really big proper crime. Also if this curfew goes through then once all of the under 16's are indoors then it will make life easier for the police patrolling to catch the proper criminals because they won't have to put up with the cheek and disrespect that they recieve off the under 16's, also
Physics Spring Coursework
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