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 Current Electricity 22 Flashcards |
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What is the S.I. unit of electric current? |
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Ampere |
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The conventional direction of current flow is along the direction of ___ charge. |
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Positive  |
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In a balanced Wheatstone bridge, the relationship between resistances is defined by the equation ___ = ___. |
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P/Q = R/S  |
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True or False: An ideal ammeter has infinite resistance. |
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False; an ideal ammeter should have zero resistance. |
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Fill in the blank: The formula for the resistance of a conductor is R = ρL/A, where ρ is the ___. |
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Resistivity |
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The relationship between the temperature coefficient of resistance and resistance is given as Rt = R0 [1 + αt]. What does α represent? |
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The temperature coefficient of resistance |
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When using Kirchhoff’s first law, what does the algebraic sum of currents at a junction equal? |
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Zero |
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True or False: The resistance of semiconductors increases with temperature. |
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False; the resistance of semiconductors decreases with temperature.  |
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What is the relationship between current and voltage in an ohmic conductor? |
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It is a linear relationship, represented by V = IR.  |
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The internal resistance of an ideal cell is ___ . |
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Zero |
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What is the effect on resistance when a wire is stretched to reduce its radius to 1/nth of its original value? |
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Its resistance increases by n4 times. |
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