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How much current does a flashlight use if its battery supplies 3.0 Volt and the bulb has a resistance of 4.0 Alpha

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  1. Resistance is 4.0 Alpha...? I think you mean 4.0 Ohms (Ohm has symbol of capital letter of Omega, Ω). Alpha (α) is different, it is the temperature coefficient of resistance.

    Anyway, you use the formula:
    I = V/R
    where
    I = current (Ampere)
    V = voltage (Volts)
    R = resistance (Ohms)

    hope this helps~ `u`

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