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Winter Chill
Lv 4
Winter Chill asked in Science & MathematicsPhysics · 2 years ago

Find the potential difference (delta V) between points C and D?

S1 and S2 are closed switches. There are two resistors, with R1 = 10 ohms and R2 being unknown. The current through R1 is 1.2 F, and the emf gives 12 V.

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  • Dr. Zorro
    Lv 7
    2 years ago
    Favorite Answer

    Because S2 is closed, the resistance between C and D is zero because R2 is short circuited. Therefore the potential difference between C and D is 0 Volt (no energy is needed to let a current go through a zero resistance)

  • oldschool
    Lv 7
    2 years ago

    The voltage across R1 = 1.2A*10Ω = 12V = Vbc so there can't be any voltage across R2 = Vcd. KVL is satisfied

  • oubaas
    Lv 7
    2 years ago

    If you parallel 0 and R2, then Rp = R2*0/(R2+0) = 0

    Vcd = Rp*I = 0*I = 0

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