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Tuesday, March 31, 2009

SPM Questions: EMF & Internal Resistance


  1. The electromotive force and internal
    resistance of the dry cell in the
    circuit
    below is 1.5 V and 0.5 ohm respectively.

What is the reading of the voltmeter when the switch is closed? (SPM04)
A. 0V
B. 1.5V
C. Less than 1.5 V
D. More than 1.5 V

Ans: C
E = V + Ir
1.5 = V + I(0.5) , then rearrange he equation,
V= 1.5 – 0.5(I)
Thus V is less than 1.5V

  1. Which circuit can be used to determine the electromotive force of a battery? (SPM
    05)


Ans: C , If the switch is opened, the voltmeter across battery will give the e.m.f reading

at

3 comments:

  1. ezznieJuly 24, 2009 at 4:11 PM

    cikgu,,saya tak reti nak baca gambar rajah di atas???cam ne nak kira???

    ReplyDelete
  2. cikgufizikSeptember 3, 2009 at 11:35 PM

    ok..u kena fhm & hafal circuit utk emf experiment..then baru u fhm camana nk jwb.
    Btw, soalan 1, dia suruh kira voltage of the voltmeter, so apply je formula emf,
    E = V + IR... V= voltage of voltmeter. Formula ni tak dibagi masa xm..so tlg hafal

    ReplyDelete
  3. AnonymousDecember 19, 2009 at 1:09 AM

    ...please where can I buy a unicorn?

    ReplyDelete