EMF, Potential Difference And Current

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| By Patted03
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Patted03
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Quizzes Created: 1 | Total Attempts: 494
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  • 1/8 Questions

    A charge of 2.5 C flows through a wire over a period of 5 s. What is the current?

    • 50 A
    • 0.5 A
    • 10 A
    • 0.1 A
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About This Quiz

—explain and apply the concept of ‘electric current’ as the rate of flow of electric charge in an electric field—this will include applying the relationship: I=q/t
—state that the direction of conventional current is that in which the flow of positive charge takes place, while the electron flow is in the opposite direction — —Explain and apply the concepts of EMF and ‘potential difference’ as the loss of potential energy of electric charges as they flow through a circuit

Circuits Quizzes & Trivia

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  • 2. 

    A charge of 2 C flows through a wire over a period of 10 s. What is the current?

    • 20 A

    • 0.2 A

    • 0.02 A

    • 2.0 A

    Correct Answer
    A. 0.2 A
    Explanation
    The current can be calculated by dividing the charge (2 C) by the time (10 s). Therefore, the current is 0.2 A.

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  • 3. 

    A charge of 4 C flows through a wire over a period of 12 s. What is the current?

    • 3 A

    • 0.33 A

    • 0.03 A

    • 30 A

    Correct Answer
    A. 0.33 A
    Explanation
    The current can be calculated using the formula I = Q/t, where I is the current, Q is the charge, and t is the time. In this case, the charge is 4 C and the time is 12 s. Substituting these values into the formula, we get I = 4 C / 12 s = 0.33 A. Therefore, the current is 0.33 A.

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  • 4. 

    A globe has a potential difference of 12 V. The current flowing through it is 4 A. How much energy is transferred to the globe in 30 s? Include units.

    Correct Answer
    1440J
    1440 J
    Explanation
    The energy transferred to the globe can be calculated using the formula: Energy = Voltage x Current x Time. Given that the potential difference is 12 V, the current is 4 A, and the time is 30 s, we can substitute these values into the formula. Energy = 12 V x 4 A x 30 s = 1440 J. Therefore, the energy transferred to the globe in 30 s is 1440 J.

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  • 5. 

    A globe has a potential difference of 5 V. The current flowing through it is 1 A. How much energy is transferred to the globe in 30 s? Include units.

    Correct Answer
    150J
    150 J
    Explanation
    The energy transferred to the globe can be calculated using the formula: Energy = Potential difference × Current × Time. Given that the potential difference is 5 V, the current is 1 A, and the time is 30 s, we can substitute these values into the formula: Energy = 5 V × 1 A × 30 s = 150 J. Therefore, the energy transferred to the globe in 30 s is 150 Joules.

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  • 6. 

    A globe has a potential difference of 4 V. The current flowing through it is 2 A. How much energy is transferred to the globe in 30 s? Include units.

    Correct Answer
    240J
    240 J
    Explanation
    The energy transferred to the globe can be calculated using the formula: energy (E) = potential difference (V) x current (I) x time (t). Plugging in the given values, we get E = 4 V x 2 A x 30 s = 240 J. Therefore, the correct answer is 240J.

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  • Current Version
  • Mar 18, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 06, 2012
    Quiz Created by
    Patted03
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