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An electric iron has a resistance of 80 ...

An electric iron has a resistance of `80 Omega` and is connected to a source of 200 V. If it is used for two hours then Calculate the electrical energy spent.

Text Solution

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Resistance `R = 80 Omega`.
Potential difference ` V = 200 V`
` :." Power P " = V^2/R`
` =((200)^2)/80 = (200 xx 200)/80`
`:." Time t = 2 hour"`
`:." Electrical energy E = P" xx "t"`
`E = 500 xx 2 = 1000 W`
` = 1 kW`
`:." Electrical energy spent = 1 kW"`
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