Name: ______________________________________ Date: ________________________ Student Exploration: Heat Transfer by Conduction Vocabulary: conduction‚ convection‚ insulate‚ radiation‚ thermal conductor‚ thermal energy‚ thermal insulator Prior Knowledge Questions (Do these BEFORE using the Gizmo.) Suppose two frying pans have been left on the stove with the burners on. One of the frying pans has a metal handle and the other has a wooden handle. 1. Which handle do you think you could
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Section 1 WHAT IS HAPPENING IN THE WIRES? INTRODUCTION Electricity is usually invisible. Except for lightning and sparks‚ you never see it in daily life. However‚ light bulbs and a magnetic compass can show you when something electrical is happening. By observing their behavior and making a few assumptions‚ you can begin forming ideas about electricity. This type of thinking is called “building a model”. INVESTIGATION ONE: WHAT IS NEEDED TO LIGHT A BULB? 1.1 Activity: Lighting bulbs in a loop
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A conductor is made of metals like copper‚ silver‚ aluminum or gold. These types of metals allows for the easy flow of electrons. Wires are made of these materials. 4. Give two examples of Insulators. An example of an insulator is rubber like those surrounding an electrical cord. Another insulator is plastic. 5. What is a Semiconductor and give an example? Semiconductors carry electrons through them under certain conditions. An example is silicon. Part 2 1. Using the Internet‚ search
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Short Notes On Atomic Structure * Atom is the smallest particle of an element- All 117 elements has atoms * Bohr model: - Planetary model (see Figure 1 below) 1. Sun (proton & neutron= nucleus) 2. Planets (electrons) 3. Orbit (shell) Figure 1: Bohr model * Each type of atoms has a certain number of electrons and protons that differentiate it from the atoms of other elements Example: 1 proton 1 electron= Hydrogen (1 type elements) 2
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Electrical technology – assignment 4 Properties of electrical materials and Effective use of technology P.5. Describe the properties and a typical application of a solid and a liquid or gas electrical conductor. A conductor is a material that allows free movement of electrons and therefore allows easy flow of electricity. Most conductors are metals. A common metal used as a conductor in electrical technology is aluminium. It is used quite a lot as it cheap‚ lightweight and in abundance compared
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are contained within the nucleus. Electrons orbit around the nucleus which could be similar to planets orbiting around the sun. As an electrician I will also be dealing with insulators. An insulator is any material that stops the flow of electrons examples are rubber‚ glass and plastic. Conductors are the opposite of and insulator they are material that easily allows electrons to flow‚ like cooper‚ gold and silver. A material that has high resistance has low conductivity‚ this means that it doesn’t
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hot water would cool faster in a foam container‚ because the foam is an insulator‚ which doesn’t let heat in. The third hypothesis stated that the whole ice would cool a liquid faster because the crushed ice will melt faster. The first conclusion was the larger beaker cools of faster because there is more surface area to cool off the water. The second conclusion was the foam cup cooled off slower because foam is an insulator so it traps the heat in‚ and glass is a conductor so it releases heat. The
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synthesise an entirely new metal called the ‘Jahn-Teller-metal’- a complex crystalline material that seems an insulator‚ superconductor‚ metal and magnet all rolled into one and this strange metal might be the newest state of matter. The researchers claim that they’ve created
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the electroscope‚ the charged metal leaves will fall‚ and its charge will be lost as electrons pass through the conductor to or from your body. The leaves on the leaf electroscope will remain raised if the material being tested is an insulator. This is because insulators do not allow electrons to flow‚ which results in the leaves of the electroscope being kept raised. Because conductors allow electrons to flow‚ the electrons can ground to or from your body‚ resulting in the leaves being
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because the octet rule dictates that if there is less than 4 valance electrons‚ they would prefer to leave the atom. 4. Describe the differences between conductors‚ semiconductors‚ and insulators. Conductors= Allow electricity to flow through. Semi Conductors= Can/Cannot allow electricity to flow through. Insulators= Do not allow electricity to flow through. 5. Use a different color to identify the metals‚ non-metals‚ and metalloids in the periodic table below. In each box list characteristics
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