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10 December, 17:43

If E = 94.2 mJ of energy is transferred when Q = 1.66 C of charge flows through a circuit element, what is the voltage across the circuit element?

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  1. 10 December, 19:28
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    V = 56.8 mV

    Explanation:

    When a current I flows across a circuit element, if we assume that the dimensions of the circuit are much less than the wavelength of the power source creating this current, there exists a fixed relationship between the power dissipated in the circuit element, the current I and the voltage V across it, as follows:

    P = V*I

    By definition, power is the rate of change of energy, and current, the rate of change of the charge Q, so we can replace P and I, as follows:

    E/t = V*q/t ⇒ E = V*Q

    Solving for V:

    V = E/Q = 94.2 mJ / 1.66 C = 56.8 mV
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