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    Resistors: Type of work done by electric current; calculate resistance in circuit

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    If an electric circuit contains only an ordinary resistor, all the work done by the electric current appears as:

    A) light

    B) rotary motion

    C) chemical action

    D) heat

    Two 10.0 ohm resistors are connected in parallel, and this combination is connected in series with a third 10.0 ohm resistor. The resistance of this network is

    A) 10.0 ohms

    B) 5.0 ohms

    C) 15.0 ohms

    D) 20.0 ohms

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