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Question
An electric bulb is rated at 220 V, 100 W. What safe current can be passed through it ?
An electric bulb is rated at 220 V, 100 W. What safe current can be passed through it ?
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Solution
The correct option is C 0.45A
In any electrical appliance their is a simple relationship between the power output of a component, the potential difference across that component, and the current running through it. This is because charge times potential difference is energy, so (charge per unit time) times (potential difference) gives (energy per unit time). Thus, we have P=VI.
From this formula, the current can be calculated as follows with the given power and voltage.
That is, I=PV=100 W220 V=0.45A.
Hence, the safe current that can be passed through the bulb is 0.45 amperes.
In any electrical appliance their is a simple relationship between the power output of a component, the potential difference across that component, and the current running through it. This is because charge times potential difference is energy, so (charge per unit time) times (potential difference) gives (energy per unit time). Thus, we have P=VI.
From this formula, the current can be calculated as follows with the given power and voltage.
That is, I=PV=100 W220 V=0.45A.
Hence, the safe current that can be passed through the bulb is 0.45 amperes.
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