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10 August, 05:06

You might have a flashlight that runs (2) d-cells of 1.5 volts each in series. the bulb is rated for 0.7 amps. what's its resistance?

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  1. 10 August, 05:15
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    From Ohm's law, we get the general equation that would relate the voltage, current, and resistance,

    V = I x R

    where V is voltage, R is resistance, and I is current. Deriving the equation for R

    R = V / I

    R = (1.5 volts) / (0.7 amps) = 2.14 Ohms
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