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An electric kettle taking 3 A "at" 210 ...

An electric kettle taking ` 3 A "at" 210 V` brings `1 L ` of water from ` 20^(@) C to 80^(@) C "in" 10 min`. Find its efficiency.

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`eta = (OP)/(IP) xx 100 = ( 10^(3) xx 4.2 xx 60)/( 210 xx 3 xx 600) xx 66.7%`
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CENGAGE PHYSICS-HEATING EFFECT OF CURRENT-Thermal Power in Resistance Connected in Circuit
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