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    Current, Potential Difference and Resistance Questions

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    1. If a lamp is measured to have a resistance of 45 ohm when it operates at a power of 80 W, what is the current in the lamp?
    A. 2.10 A
    B. 1.3 A
    C. 0.91 A
    D. 0.83 A

    2. If a lamp has a resistance of 120 ohm when it operates at a power of 1.00 x 10^2 W, what is the potential difference across the lamp?
    a. 110 V
    b. 120 V
    c. 130 V
    d. 220 V

    3. An electric toaster requires 1100 W at 110 V. What is the resistance of the heating coil?
    a. 7.5 ohm
    b. 9.0 ohm
    c. 1.0 x 10^1 ohm
    d. 11 ohm

    Please show the work done, formulas used and the answer. Thank you!

    © BrainMass Inc. brainmass.com February 24, 2021, 2:25 pm ad1c9bdddf
    https://brainmass.com/physics/electric-power/current-potential-difference-resistance-questions-19792

    Solution Preview

    I = Current, R = Resistance, V = Voltage, P = Power
    Ohm's Law = V = I*R
    ...

    Solution Summary

    Ohm's Law = V = I*R
    P = V*I = I^2*R = V^2/R

    I = Current, R = Resistance, V = Voltage, P = Power

    $2.19

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