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    We usually assume that ammeters have negligible resistance and voltmeters have
    infinite resistance.
    The determination of ε and r is not affected by using an ammeter with non-negligible
    resistance but is affected by using a voltmeter with a low resistance.
    Explain why.(4)
    THE MARKING SCHEME SAYS
    Ammeter explanation:
    If ammeter has resistance, current decreased
    but doesn’t affect the determination because current through cell/r is
    measured
    Or doesn’t affect the determination because the voltmeter measures the
    terminal p.d. for that current
    OR
    The resistance of the ammeter contributes to the load/circuit/total
    resistance
    Values of p.d. corresponding to given values of current will be
    unchanged
    Voltmeter explanation:
    If voltmeter has smaller resistance it would draw current
    measured current not current through cell/r
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    (Original post by maryam1234567)
    we usually assume that ammeters have negligible resistance and voltmeters have
    infinite resistance.
    The determination of ε and r is not affected by using an ammeter with non-negligible
    resistance but is affected by using a voltmeter with a low resistance.
    Explain why.(4)
    the marking scheme says
    ammeter explanation:
    If ammeter has resistance, current decreased
    but doesn’t affect the determination because current through cell/r is
    measured
    or doesn’t affect the determination because the voltmeter measures the
    terminal p.d. For that current
    or
    the resistance of the ammeter contributes to the load/circuit/total
    resistance
    values of p.d. Corresponding to given values of current will be
    unchanged
    voltmeter explanation:
    If voltmeter has smaller resistance it would draw current
    measured current not current through cell/r
    someone pleaseeee help me
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    Which topic is this
    Posted on the TSR App. Download from Apple or Google Play
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    (Original post by adamantacademic)
    Which topic is this
    THIS IS BASICALLY A QUESTION FROM THIS PPhttp://pmt.physicsandmathstutor.com/download/Physics/A-level/Past-Papers/Edexcel-IAL/Unit-2/June%202013%20QP%20-%20Unit%202%20Edexcel%20Physics% 20A-level.pdf
    ITS Q17 (b)
    of the year JUNE 2013 IAL 6PHO2/01
    IF U KNOW IT THEN PLEASE GUIDE ME!!
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    (Original post by MARYAM1234567)
    THIS IS BASICALLY A QUESTION FROM THIS PPhttp://pmt.physicsandmathstutor.com/download/Physics/A-level/Past-Papers/Edexcel-IAL/Unit-2/June%202013%20QP%20-%20Unit%202%20Edexcel%20Physics% 20A-level.pdf
    ITS Q17 (b)
    of the year JUNE 2013 IAL 6PHO2/01
    IF U KNOW IT THEN PLEASE GUIDE ME!!
    Apologies!
    Posted on the TSR App. Download from Apple or Google Play
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    (Original post by adamantacademic)
    Which topic is this
    This is basically about resistance in battery and the total energy stored in a battery
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    (Original post by adamantacademic)
    Apologies!
    check with someone and let me know ASAP!!!
 
 
 

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