cheap. It seems that it would be simple to capture the sun’s rays and make electricity‚ but the material that “captures” the rays is very expensive due to it having to be a really pure material; if we use materials that are not as “pure” the electric current can’t go through the material easily and it loses efficiency. The sun has been here for billions of years and it is still going to be here billions of years past our generation‚ it’s been releasing energy since day one. It is our duty and greatest
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WAVES & SOUND Refraction waves bending when passing through different materials/medium Doppler Effect the effect of a change in frequency‚ resulting from relative motion between source of wave & observer Sound Intensity loudness‚ rate at which energy flows through an area perpendicular to direction of wave Beats 2 waves of similar frequency causing interference heard as beats Reflection Occurs when particles bounce off one another in opposite direction Decibel
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has value or not: this is by far the biggest theme of the novel; it keeps coming back in every aspect of the story. Our main character‚ Rick Deckard‚ defines the human nature and the meaning of life according to this empathic ability. He hates his electric sheep because it doesn’t have any empathic feelings towards him (or anybody else for that matter)‚ despite the fact that it behaves exactly like an ordinary sheep. Using the same logic he figgures that it’s ok killing androids (which of course is
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Grade 10 Electricity I Q t I = current Q = net charge flowing t = time 1A 1C 1s Unit: Q = Coulomb (C) I = Ampere (A) t = Second (s) Potential difference Work done to move a unit charge from one point to another V W Q Unit Volt 1 Volt 1 joule 1 coulomb 1V 1J C 1 Ohm’s law Current potential difference V I V = IR (R = resistance) Unit (R) 1 1V 1A (Ohm) Factors on which resistance depends 1. 2. R R l‚ when A and material constant l = length A‚ when l and material constant
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(Hypothesis): I predict that the longer the wire the higher the resistance‚ and the shorter the wire the lower the resistance. Knowledge: Resistance is that property of electric components that turn electric energy into heat in opposing the passing of an electric current.It can be beneficial‚ as in electric heaters‚ or a pest‚ as in light bulbs‚ where the heat is produced alongside the light – we want maximum light and minimum heat. Reistance is often unwanted and we try to minimise
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electricity. The lights on the streets are lit by the electric current. Electric fans work in the court‚ high court and office-rooms. Trains and trams are run by the electric power. So‚ electricity is no longer a strange thing. Discovery of electricity: About six hundred years back the people of Asia Minor and Greece had a very crude idea of electricity. Next‚ the American Scientist Banjamin Franklin proved with the help of a kite that there is electric power in the clouds. The lightening is nothing but
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Physics Moment of a force: Moment of a force = force x perpendicular distance of the line if action if the force from fulcrum Law of moments: When a body is in equilibrium the sum of the clockwise moments about any point equals the sum of the anticlockwise moments about the same point. Centre of mass: Centre of mass is the point where whole mass of the body assumes to be concentrated. II. If the vertical line through the centre of mass is outside the base it will be a topples but if it’s passed
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do the symbols { } { } mean in electric circuit? Q.3 Balance the reaction CuO + HCl → CuCl2 + H2O Q.4 Name the process in which plants release CO2 . Q.5 what is displacement reaction? Give an example of is displacement reactions? Q.6 Write the differences between Autotrophic and parasitic nutrition. Q.7 An electric bulb draws a current of 0.9 A for 3 minutes. Calculate the amount of electric charge that flows through the circuit. Section B (Choose
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things such as cold air‚wood and plastic. Then there are things that conduct electricity and current flows through them‚ they are called conductors. examples of conductors are most metals like copper and steel. Other materials that are sometimes used as conductors are silver‚ gold‚ and aluminum. Copper is still the most popular material used for wires because it is a very good conductor of electrical current and it is fairly inexpensive when compared to gold and silver. Aluminum and most other metals
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e. directly connected resulting in heavy current flow called "short circuit current". This high current heats up the terminations‚ switches‚ plugs & cable due to which temperature rises to such a high degree that it is sufficient to generate sparking which further leads to fire. PROTECTION OF CIRCUITS : In order to restrict the short circuit currents and also to.cut off or isolate the faulty circuit from electric supply so that high short circuit current is interrupted before fire starts‚ appropriate
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