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11 May, 18:03

A torch bulb is rated 2.5V and 750mA. Calculate its power, its resistance and the energy consumed if this bulb lighted for 4 hours

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  1. 11 May, 18:12
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    Using Ohm's Law, we can derived from this the value of resistance. If I=V/R, therefore, R = V/I

    Substituting the values to the given,

    P = Power = ?

    R = Resistance = ?

    V = Voltage = 2.5 V

    I = Current = 750 mA

    R = V/I = 2.5 / (750 x 10^-3)

    R = 3.33 ohms

    Calculating the power, we have P = IV

    P = (750 x 10^-3) (2.5)

    P = 1.875 W

    The power consumption is the power consumed multiply by the number of hours. In here, we have;

    1.875W x 4 hours = 7.5 watt-hours
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