To calculate the energy used by appliance first calculate the power. The formulae for calculating power(<em>P</em>) is , where V stands for voltage and I stands for current.
In the given problem, V = 240 volts and I = 15 amp. Therefore,
Now, formulae for calculating energy used i.e. work(W) is , where <em>t</em> is the time.
In the given question time is 4 hr. Therefore energy used will be,
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