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An electric tungsten bulb is connected i...

An electric tungsten bulb is connected into a home circuit. The home electric supply runs at 220 V potential difference. When switched on, a current of 0.45 A flows through the bulb What must be power (wattage)of the bulb? if it is kept on for 10 hours, how many units of electricity will be consumed?

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The correct Answer is:
Power of the bulb is 99 watt and 0.99 units of electricity will be consumed in 10 hours.
`"Given : Potential difference (V) = 220 V,"`
`" Electric current (I) = 0.45 A"`
`" Time (t) = 10 hours"`
`"To find: Power (P), units of electricity consumed"`
`"Formula: P = VI"`
`"Calculation: From formula,"`
`P=220xx0.45=99W`
In 10 hours, the power consumed is `99xx10=990Wh=0.99kWh`
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