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18 Cards in this Set
- Front
- Back
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Structure of Atom |
Atom consist of Protons, Electrons and Neutron. Electron and Proton have the same charge, while Neutrons are neutral |
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Electric Charge charasteristics |
-Protons (Positive charge) -Electron (Negative charge) -Symbol, Q -Coulomb (C) 1.6 x 10^19 |
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Electrostatic Force |
Force that exists between charges. Same type repel and different types attract. Force is proportional to distance |
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Electric Current |
Electric charges (Electrons) that flows through a conductor. Defined as rate if flow over charge where number of charge over time. SI unit is Ampere, A |
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Electric field |
Region which an electric chaege experiences an electric force. |
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Electric field line |
Electric field represented by arrowed lines. Indicates magnitude, direction |
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Describe the electric field of positive charge |
Lines move outwards |
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Describe the electric field of negative charge |
Lines move inwards |
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Potential Difference |
The work done when 1C of charge moves between two points in an electric field. |
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Resistance |
The ratio of potential difference across a conductor to the electric current flowing through a conductor. Measure of conductor's resistance to electric current. |
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Ohm's Law |
The electric current flowing through a conductor is directly proportional to potential difference across it if temperature is constant |
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Ohmic conductor |
Conductors that obey Ohm's Law |
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Non-ohmic conductor |
Conductors that do not obey Ohm's Law |
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Disadvantages of resistance |
Causes some electrical energy to turn into heat. Low efficiency. |
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Advantages of resistance |
Heat from filament produces light. Heat energy generated for warmth |
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Factors that affect resistance |
Length - d.p to length Cross section area - I.p to area Type of material - nichrome to silver Temperature - increases to temperature |
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F |
F |
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Superconductor |
Material whose resistance becomes zero when drops to certain value called critical temperature |
